These easy air fryer flapjacks are soft and chewy in the middle with lightly crisp, golden edges and rich buttery caramel flavour. Made with rolled oats, butter, brown sugar and golden syrup, they bake in a shallow 20cm (8-inch) tin at 160°C in just 16-20 minutes (cook them for 16 minutes if you love an extra soft, chewy flapjack, or up to 20 minutes for a firmer texture with crispier edges).
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A Quick Look At The Recipe - Air Fryer Flapjacks
I tested these flapjacks in my Ninja air fryer using a shallow 20 cm metal tin, checking them at different points between 16 and 20 minutes. My family preferred them at around 18 minutes, when the edges were lightly golden but the middle was still soft and chewy; they firmed up perfectly once completely cool. Beth (Effortless Foodie)
🕒 Ready In: Prep Time - 7 minutes, Cook Time - 16-20 minutes
👪 Serves: 16
🍽 Calories: 238 per bar
🥣 Main Ingredients: Rolled Oats, Butter, Light Brown Sugar, Demerara Sugar, Golden Syrup
📖 Dietary Info: Vegetarian, freezer-friendly
👌 Difficulty: Easy
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If you've never made flapjacks in an air fryer before, you'll be surprised how straightforward it is. This easy air fryer flapjack recipe uses just four basic ingredients - golden syrup, butter, sugar and oats - and produces perfectly chewy flapjacks every time.
These small batch air fryer flapjacks come together quickly, making them ideal for lunchboxes, an afternoon snack, or a simple bake to have on hand during the week.
They're a firm favourite in our house, and cooking golden syrup flapjacks in the air fryer reduces the baking time compared to traditional flapjacks.
A shallow 20cm square tin fits perfectly in my Ninja Foodi Air Fryer, but the right size will depend on your model. In a round air fryer, a 20cm round sandwich tin usually works well. If you're using a dual drawer air fryer, a loaf tin or small rectangular baking dish is often more suitable.
Flexible silicone air fryer cake tins are another practical option, as they mould to the shape of the basket and make removal easy.
Love air fryer baking? You might also like my air fryer rock cakes, air fryer blueberry muffins, air fryer chocolate brownies, air fryer fruit scones and air fryer cherry Madeira cake recipes.
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Jump to:
- A Quick Look At The Recipe - Air Fryer Flapjacks
- Why make flapjacks in an air fryer?
- Why you'll love this easy flapjack recipe!
- 5* Reader review
- Ingredient notes
- Need to substitute an ingredient?
- Variations
- How to make it even better!
- How to make flapjacks in air fryer
- How I tested this recipe
- Beth's Top Tips
- Serving suggestions
- Storage
- Air fryer flapjacks FAQs
- Troubleshooting Guide
- More air fryer baking recipes
- More flapjack recipes
- Recipe
- 💬 Comments
Why make flapjacks in an air fryer?
An air fryer's compact cooking chamber heats quickly and is convenient when you do not want to switch on a full-size oven.
It is particularly useful for making a smaller batch of flapjacks, although the exact cooking time will depend on your air fryer and the size and depth of your tin.
The edges can brown quickly in an air fryer, which is why these flapjacks are cooked at a lower temperature than many conventional oven recipes.
Why you'll love this easy flapjack recipe!
- Quick and easy air fryer recipe - made with just four simple ingredients, these air fryer flapjacks are faster to bake than traditional oven-baked flapjacks.
- Classic golden syrup flavour - the combination of brown sugar and demerara sugar gives the flapjacks a rich caramel flavour, while golden syrup helps bind the oats and keeps the centre soft and chewy.
- Easy to customise - add nuts, dried fruit, chocolate chips or swap the syrup for honey or maple syrup.
- Perfect for lunchboxes - these chewy oat bars are sturdy, filling and ideal for snacks on the go.
- Great for batch baking - store in an airtight container for up to a week or freeze for up to 3 months.
5* Reader review
This recipe is amazing. I got 3 trays out of one batch as I have a Ninja dual air fryer. These were all gone within 24hrs which means I now have to make more...⭐⭐⭐⭐⭐
- Kirsty
Ingredient notes
A full ingredients list along with Metric and US Customary measurements, can be found in the recipe card at the end of this post.
Porridge Oats (Rolled Oats) - Standard rolled porridge oats are best for making chewy flapjacks that hold together well. Quick oats can also be used and will produce a softer, more compact texture. Jumbo oats create a coarser flapjack but can make the bars more likely to crumble, particularly if used on their own.
Butter - Use ordinary salted or unsalted butter. Butter gives the flapjacks their rich flavour and helps the oats bind together as they cool. When using unsalted butter, add a small pinch of salt to balance the sweetness. For dairy-free flapjacks, use a firm vegan block butter rather than a soft spreadable margarine.
Golden Syrup - Gives traditional British flapjacks their distinctive flavour and helps hold the oats together. Honey can be used, but it will change the flavour and may produce a slightly softer result. Maple syrup is thinner than golden syrup and is not an exact like-for-like substitute.
Sugar (Light Brown Sugar + Demerara Sugar) - Adds sweetness and a subtle crunch. You can use just one type of sugar or swap with granulated sugar (white sugar) or caster sugar (superfine sugar).
Vanilla Extract - Enhances the flavour of the flapjacks. You can leave it out for a more traditional flavour or replace it with a small pinch of ground cinnamon.
Need to substitute an ingredient?
Have an allergy or dietary preference? Let AI customise the recipe for you.
Variations
- Swap out the golden syrup for honey or maple syrup for a different flavour. You might also like to try my maple syrup flapjacks in the air fryer (just reduce the cooking time by 5 minutes).
- Try adding in some spices such as cinnamon or nutmeg.
- Add chopped apple to the mixture for a warm and comforting bake. You could also try my apple flapjacks in the air fryer (reducing the cooking time by 5 minutes).
- Try my Biscoff flapjacks in the air fryer (reducing the baking time by 5 minutes).
How to make it even better!
Add more protein
- Swap half the butter for peanut butter or almond butter for a protein boost of approximately 24g.
- Add 1 tablespoon of vanilla protein powder to add 10g of protein.
- Stir 30g chopped almonds into the oat mixture before baking to add 6g protein (plus healthy fats and crunch).
Boost the fibre
- Add 20g ground flaxseed to the oat mixture for an extra 5g fibre and a subtle nutty flavour.
- Add 20g of chia seeds for an extra 6.5g fibre and 3.5g protein. You could also add sunflower seeds or pumpkin seeds.
- Mix in 50g chopped dried apricots to add around 3.5g fibre along with natural sweetness.
- Drizzle the flapjacks with 2 tablespoon of melted 80% dark chocolate for an added 2.5g of fibre.
Cut back on the sugar
- Replace 25g of the brown sugar with 50g unsweetened apple purée to reduce the added sugar while keeping the flapjacks moist.
- Add 1 teaspoon ground cinnamon to enhance the sweetness naturally, so you won't miss the sugar.
How to make flapjacks in air fryer
One: Preheat the air fryer to 160°C (320°F) and set the timer for 20 minutes. Grease and line a suitable baking tin with nonstick baking paper. I use a 20cm (8") square tin in my air fryer, but you may need to use a different size tin. You can also use a firm sided silicone tin, provided it fits inside your air fryer (please note silicone does not conduct heat in quite the same way as metal, so the flapjacks may take a few minutes longer to cook).
Two: In a large saucepan, melt the butter, sugars and golden syrup together on a low heat, mixing with a wooden spoon to prevent it from sticking to the bottom of the pan. Do not allow the mixture to boil. Boiling can dissolve and cook the sugars too much, producing hard flapjacks once cooled.
Three: Stir in the vanilla extract, followed by the rolled oats. Mix thoroughly until every oat is evenly coated in the buttery syrup mixture.
Four: Spoon the mixture into the lined tin and spread it into an even layer. Press it down firmly with the back of a spoon or spatula, making sure to compact the mixture right into the corners and edges. Place the tin in the air fryer and cook for 16-20 minutes. Cook for 16 minutes if you like your flapjacks extra soft and chewy, 20 minutes for a firmer texture with crispier edges, or 18 minutes for the perfect balance of chewy centres and lightly golden edges (our family's favourite!). Start checking after 15 minutes, as cooking times can vary slightly depending on your air fryer model and how powerful it is. The flapjacks are ready when the edges are lightly golden and the centre is just set but still feels slightly soft-it will firm up as it cools.
💡 Pro Tip - The flapjacks are ready when the edges are lightly golden and the centre no longer appears wet. The middle should still feel slightly soft when gently pressed.
Five: Remove the tin from the air fryer and leave the flapjack to cool completely in the tin before slicing.
How I tested this recipe
I developed and tested these flapjacks in my own kitchen using a shallow 20 cm metal baking tin that fits inside my air fryer.
I found that cooking them at 160°C produced a much more even result than using a higher temperature. The edges became lightly golden while the centre stayed soft and chewy rather than turning hard or dry.
At around 16 minutes, the flapjacks were particularly soft and chewy. Cooking them for closer to 20 minutes produced firmer bars with slightly crisper edges.
Tested in: Ninja Foodi
Setting used: Air Fry
Tin used: Shallow 20 cm/8-inch metal tin
Best result: 18 minutes
Beth's Top Tips
- Press the oat mixture down firmly and evenly. Loosely packed oats are one of the main reasons flapjacks crumble when sliced.
- Use a shallow metal tin for the most even cooking. A deeper mixture will need longer and may brown on top before cooking through in the centre.
- Start checking after 15 minutes. Air fryers can vary considerably in power, even when set to the same temperature.
- Do not boil the butter and sugar mixture. Gentle melting produces softer, chewier flapjacks.
- Leave the flapjacks to cool completely before lifting them out and cutting them. They will be fragile while warm.
- For especially neat squares, place the fully cooled flapjack in the fridge for 20-30 minutes before slicing it with a sharp knife.
Serving suggestions
These air fryer flapjacks are versatile and perfect for any occasion. Serve them with a cup of tea or coffee for a simple Afternoon Tea treat (alongside other classic bakes such as air fryer sausage rolls, cherry scones, fruit scones, and chocolate tiffin), or slice into bars for school lunchboxes and work snacks.
Crumble over Greek yoghurt with fresh fruit for breakfast, drizzle with chocolate for a sweet twist, or enjoy warm with custard or ice cream for dessert.
They're also ideal for picnics, as they keep well and are easy to transport.
Storage
Store - in an airtight container at room temperature for up to five days. Place a sheet of baking paper between the layers to prevent them from sticking together.
Freeze - flapjacks can be frozen for up to three months. Once completely cool, cut them into squares and place them in a freezer-safe container with baking paper between each layer. Alternatively, wrap the individual squares before freezing. Defrost at room temperature for a few hours before serving.
Air fryer flapjacks FAQs
Flapjacks take approximately 16-20 minutes at 160°C in a shallow 20 cm metal tin. Start checking after 15 minutes because more powerful air fryers and thinner batches may cook more quickly.
Preheating gives the most consistent cooking time, particularly if your air fryer model recommends it. Some air fryers heat almost instantly, so consult the manufacturer's instructions. When you do not preheat, the flapjacks may require an additional minute or two.
Yes. Bake the flapjacks in a preheated oven at 180°C conventional or 160°C fan until the edges are lightly golden and the centre remains slightly soft. The exact time will depend on the size and depth of the tin, so begin checking after approximately 20 minutes.
Yes, (this recipe is made in a Ninja Foodi) provided you have a baking tin that fits comfortably inside the drawer with enough room for air to circulate. For a dual-drawer Ninja air fryer, you may need to divide the mixture between two smaller tins. The cooking time may be shorter if the flapjacks are spread more thinly.
Yes, although air fryer settings vary between models. Use the same temperature as a starting point, but check the flapjacks regularly because the Bake setting may circulate the hot air differently from the Air Fry setting.
Replace the dairy butter with a firm vegan block butter. Golden syrup is normally suitable for vegans, so it does not usually need to be replaced. Check the individual product label when cooking for someone following a strict vegan diet.
Choosing the right oats makes a noticeable difference to the texture of your flapjacks, particularly when making air fryer flapjacks.
Rolled Porridge Oats (Old-Fashioned Oats) - Best Choice!
Rolled oats are the best option for traditional British flapjacks. They absorb the melted butter and golden syrup mixture evenly, creating that classic soft and chewy texture. They also hold together well, making them ideal for both oven baking and flapjacks in an air fryer.
Quick Oats (Quick-Cooking Oats)
Quick oats can be used if that's what you have, but they produce a softer, more compact texture. The finished flapjacks may be slightly less chewy and more dense.
Jumbo Oats - Not Recommended
Jumbo oats don't absorb the syrup mixture as effectively, which can lead to crumbly or uneven flapjacks. They also create a looser structure, making the bars harder to slice neatly.
Gluten-Free Oats
If you need gluten-free flapjacks, use certified gluten-free rolled oats. The texture will be very similar to standard rolled oats.
In short, for the best chewy air fryer flapjacks, standard rolled porridge oats are the most reliable choice.
Troubleshooting Guide
Problem: Why are my flapjacks crumbly?
Fix: Flapjacks can crumble if the mixture was not pressed firmly enough into the tin, if too many jumbo oats were used or if they were sliced before they had cooled. Make sure all the oats are thoroughly coated in the syrup mixture, compact them firmly and leave the flapjack to cool completely before cutting it.
Problem: Why are my air fryer flapjacks too hard or crunchy?
Fix: They've likely been overbaked or cooked at too high a temperature. Air fryer baking is quicker than oven baking, so check a few minutes early. The centre should still feel slightly soft when removed, as flapjacks firm up while cooling.
Problem: Why are my flapjacks undercooked in the middle?
Fix: A raw or very soft middle is often caused by using a tin that is too small or deep. Return the tin to the air fryer and cook it in two-minute intervals at 160°C until the centre no longer looks wet. Next time, use a wider, shallower tin or divide the mixture between two smaller tins.
Problem: Why did my flapjacks stick to the tin?
Fix: Grease and line your baking tin with parchment (baking paper), leaving some overhang for easy lifting. Silicone air fryer cake tins can also help prevent sticking and make removal easier.
Problem: Why are my flapjacks falling apart after baking?
Fix: They may not have cooled long enough to set properly. Flapjacks need time for the butter and syrup to firm up. Leave them in the tin until completely cool - chilling in the fridge can help speed up the process.
Problem: Why are my flapjacks greasy?
Fix: Warm flapjacks can look greasy because the butter and syrup have not yet set. Allow them to cool completely before assessing the texture. Also check that the butter and oats were measured accurately and that the mixture was stirred thoroughly before being pressed into the tin.
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Recipe
Easy Air Fryer Flapjacks
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Ingredients
- 225 g Butter
- 100 g Demerara Sugar
- 100 g Light Brown Sugar
- 5 tablespoon Golden Syrup or use honey
- 360 g Oats rolled porridge oats
- 1 teaspoon Vanilla Extract
Instructions
- Preheat the air fryer to 160°C (320°F) and set the timer for 20 minutes. Grease and line a suitable baking tin with nonstick baking paper. I use a 20cm (8") square tin in my air fryer, but you may need to use a different size tin. You can also use a firm sided silicone tin, provided it fits inside your air fryer (please note silicone does not conduct heat in quite the same way as metal, so the flapjacks may take a few minutes longer to cook).
- In a large saucepan, melt the butter, sugars and golden syrup together on a low heat, mixing with a wooden spoon to prevent it from sticking to the bottom of the pan. Do not allow the mixture to boil. Boiling can dissolve and cook the sugars too much, producing hard flapjacks once cooled.225 g Butter, 100 g Demerara Sugar, 100 g Light Brown Sugar, 5 tablespoon Golden Syrup
- Stir in the vanilla extract, followed by the rolled oats. Mix thoroughly until every oat is evenly coated in the buttery syrup mixture.360 g Oats, 1 teaspoon Vanilla Extract
- Spoon the mixture into the lined tin and spread it into an even layer. Press it down firmly with the back of a spoon or spatula, making sure to compact the mixture right into the corners and edges. Place the tin in the air fryer and cook for 16-20 minutes. Cook for 16 minutes if you like your flapjacks extra soft and chewy, 20 minutes for a firmer texture with crispier edges, or 18 minutes for the perfect balance of chewy centres and lightly golden edges (our family's favourite!). Start checking after 15 minutes, as cooking times can vary slightly depending on your air fryer model and how powerful it is. The flapjacks are ready when the edges are lightly golden and the centre is just set but still feels slightly soft-it will firm up as it cools.💡 Pro Tip - The flapjacks are ready when the edges are lightly golden and the centre no longer appears wet. The middle should still feel slightly soft when gently pressed.
- Allow the flapjack to cool in the tin for at least 2 hours (preferably overnight), before cutting them into squares with a sharp knife.
Video
Notes
- Air fryer models vary. Cooking times for air fryer flapjacks may differ slightly depending on your model and basket size. Check from 15 minutes onwards - the edges should be golden and the centre slightly soft.
- Flapjacks firm up as they cool. They may look underdone when removed from the air fryer, but will set as the butter and syrup cool. Leave to cool completely before slicing.
- Press the mixture firmly. Compacting the oats well in the tin helps prevent crumbly flapjacks.
- Tin size matters. A shallow 20cm square tin works well in a Ninja Foodi. If using a smaller tin, the flapjacks will be thicker and may need 2-3 extra minutes.
- Oats choice affects texture. Rolled porridge oats (US: old-fashioned oats) give the best chewy texture. Quick oats create a softer flapjack. Avoid jumbo oats.
- Substitutions. Golden syrup can be replaced with honey or maple syrup, though flavour and texture will vary slightly.
- Storage. Store in an airtight container at room temperature for up to 5 days or freeze for up to 3 months.
Nutritional Information (Approximate)
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Kirsty Harvey says
This recipe is amazing I got 3 tray out of one batch as I have a ninja dual. These were all gone within 24hrs which means I now have to make more lol
Harini Vino says
Wow! this recipe is super yummy and looks delicious. Thanks for this wonderful recipe.
Kushigalu says
I never knew you could make such delicious bars in the air fryer. Thanks for the recipe.
Ieva says
We make flapjacks every single week and take them to work as a snack, but this was the first time I made them in an air fryer. Your recipe truly works (we added some dried apricots too)! Great texture!
nancy says
tasty oat bars - i couldn't believe i could make flapjacks in the air fryer. it came together in no time!
Sara Welch says
Enjoyed these for breakfast this morning and started my day off right! Easy and delicious; another great recipe for my air fryer, indeed!
Diana Reis says
These are delicious and super easy to do in the air fryer. I definitely thought these were something different as an American, but it was a happy accident to find this delicious recipe.
PETER JACKSON says
Can I use silicone moulds instead of backing tins TIA
Beth Sachs says
Yes, silicone moulds can be used.