These slow cooker chicken fajitas are packed with flavour, tender, and incredibly easy to make. Just add all the ingredients to your slow cooker, switch it on, and let it work its magic for six hours.
They are the perfect solution for busy weeknights, giving you a delicious, hands-off dinner when time is tight.
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A Quick Look At The Recipe
✅ Recipe Name: Slow Cooker Fajitas
🕒 Ready In: 6 hours 10 minutes
👪 Serves: 6
🍽 Calories: 232 per serving
🥣 Main Ingredients: Chicken Breasts, Peppers, Onions, Tomato Puree
📖 Dietary Info: Good source of protein
👌 Difficulty: Easy
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In our household, slow cooker fajitas are always a favourite for dinner! I've adapted the classic fajita recipe so it can be cooked easily in a slow cooker. Just toss in the chicken, peppers, onions, and spices, switch it on, and let it work its magic - simple, hands-off cooking that fills the house with amazing aromas.
The best part? This recipe is so versatile - you can easily transform it into slow cooker chicken fajita pasta by adding cooked pasta at the end of cooking.
If you love slow cooker chicken recipes, there are plenty more to try on the blog, including slow cooker chicken chasseur, slow cooker hunters chicken, and slow cooker diet coke chicken.
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✔️ Why should you try it?
- Tender, juicy slow cooker chicken fajitas - chicken cooked to perfection with warming spices for maximum flavour.
- Packed with colourful vegetables - peppers and onions add sweetness, crunch, and nutrition.
- Quick and easy family-friendly dinner - toss ingredients in the slow cooker for a fuss-free, hands-off meal.
- Versatile recipe for busy weeknights - easily transform into slow cooker chicken fajita pasta for a hearty twist your family will love.
🥘 Ingredients
A full ingredients list along with Metric and US Customary measurements, can be found in the recipe card at the end of this post.
Chicken breasts - boneless, skinless, sliced into strips; or use chicken thighs or turkey breast.
Onion - thinly sliced; red or shallots work well too.
Garlic - peeled and chopped; or 1 teaspoon garlic powder/1 tablespoon paste.
Peppers (Bell Peppers) - thinly sliced; add green peppers, courgettes, or mushrooms if you like.
Tomato purée - for a smoky sauce; substitute passata or crushed tomatoes if needed.
Fajita seasoning - homemade mix of chilli, smoked paprika, cumin, coriander, oregano, cinnamon; or use store-bought.
Thickening granules - easy sauce thickener; or use cornflour but finish on the hob to thicken.
To serve - lime wedges, tortilla wraps, grated cheddar, salsa, guacamole, or soured cream; dairy-free options optional.
Need to substitute an ingredient?
Have an allergy or dietary preference? Let AI customise the recipe for you.
📖 Variations
- Protein swaps: Use chicken thighs, turkey, beef, or go vegetarian with beans or extra vegetables.
- Extra veggies: Add mushrooms, courgettes, corn, or jalapeños for colour and flavour.
- Spice & flavour twists: Boost heat with chilli or chipotle, or add lime zest.
- Serving ideas: Turn into slow cooker chicken fajita pasta, tacos, quesadillas, or serve over rice or lettuce wraps.
🔪 How to make chicken fajitas in slow cooker
The recipe card with ingredient quantities and detailed instructions can be found at the bottom of the post
One: Place the sliced onions, peppers, and chopped garlic into the slow cooker.
Two: Lay the chicken breast strips on top of the vegetables.
Three: Sprinkle over the fajita seasoning and spoon in the tomato purée. Add a pinch of salt, then gently mix everything together to combine.
Four: Cover and cook on low for 6 hours. To thicken the sauce, stir in 2-3 tablespoons of thickening granules until it reaches your desired consistency, or leave the lid off for the last hour to naturally reduce and thicken the sauce.
Top Tips
- If you prefer convenience, use store-bought fajita seasoning. Two standard supermarket sachets work perfectly for 1kg of chicken.
- Boost the nutritional content by adding a drained tin of black beans for extra protein and fibre.
- Make it spicier by doubling the chilli quantity in the seasoning to suit your taste (see recipe card for amounts).
- Turn it into slow cooker chicken fajita pasta by stirring in 200g (dry weight) of cooked pasta for the last 5 minutes of cooking.
- To thicken the sauce, leave the lid off for the final hour of cooking to naturally reduce it.
🍴 Serving suggestions
Serve the slow cooker chicken fajitas with warm tortilla wraps, grated cheddar, guacamole, salsa, soured cream, lime wedges, and a side of baked carrot fries or air fryer sweet potato fries.
Storage
Store - the cooked fajita chicken mix can be stored in the fridge for up to 3 days.
Freeze - for up to 3 months. Once cooled, place the leftovers in a freezer-safe container.
❓ Frequently asked questions
Yes - for crisp-tender peppers and onions, add them to the slow cooker about 30 minutes before the end of cooking.
The chicken is done when it is no longer pink inside, the juices run clear, or it easily shreds with a fork.
Traditionally, soured cream, salsa, guacamole and grated cheese are used as fajita toppings. I sometimes add sliced red onion and chopped coriander too.
Troubleshooting Guide
| Problem | Fix |
|---|---|
| Chicken is dry or overcooked | Slow cookers vary in temperature, so check your chicken at around 5-5½ hours on low. Using chicken thighs instead of breasts can help keep it juicier. |
| Vegetables are too soft or mushy | Add peppers and onions during the last 30-60 minutes of cooking for a firmer texture. |
| Sauce is too watery | Leave the lid off for the final hour to reduce naturally, or stir in 2-3 tablespoons of thickening granules. |
| Fajitas are not spicy enough | Increase the chilli. |
😋Related recipes
More easy slow cooker recipes to try:
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Recipe
Slow Cooker Chicken Fajitas
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Equipment
- Chopping Board
- Knife
Ingredients
- 1 kg Chicken Breasts cut into bite size pieces
- 1 Onion sliced
- 4 Garlic Cloves peeled and chopped
- 3 Red and or Yellow Peppers sliced
- 2 tablespoon Tomato Puree
- 3 tablespoon Thickening Granules
Fajita Seasoning
- 1 teaspoon Chilli Flakes
- 1 tablespoon Cumin
- 1 tablespoon Smoked Paprika
- 2 teaspoon Oregano
- ½ teaspoon Cinnamon
- 2 teaspoon Ground Coriander
- 1 teaspoon Salt
Instructions
- Place the sliced onions, peppers, and chopped garlic into the slow cooker.1 Onion, 4 Garlic Cloves, 3 Red and or Yellow Peppers
- Lay the chicken breast strips on top of the vegetables.1 kg Chicken Breasts
- Mix up the fajita seasoning in a small bowl and add this to the slow cooker with the tomato puree. Give everything a good stir.1 teaspoon Chilli Flakes, 1 tablespoon Cumin, 1 tablespoon Smoked Paprika, 2 teaspoon Oregano, ½ teaspoon Cinnamon, 2 teaspoon Ground Coriander, 1 teaspoon Salt, 2 tablespoon Tomato Puree
- Cook on low for 6 hours (4-5 hours on high). Stir in 3 tablespoon of thickening granules at the end of cooking or alternatively spoon the chicken fajita mix into a saucepan and add a cornflour paste. Bring to the boil on the hob and allow to thicken.3 tablespoon Thickening Granules
- For slow cooker chicken fajita pasta: Cook 200g (dry weight) of pasta and stir into the chicken fajitas for the last 5 minutes for cooking.
Notes
- Ready-made fajita seasoning works well if you prefer convenience.
- Add a tin of black beans for extra protein or stir in cooked pasta at the end for fajita pasta.
- Leave the lid off the last hour or use thickening granules to thicken the sauce.
veenaazmanov says
Simple and yet so flavorful. Love the Slow Cooker option, Makes life simple and quick and easy too.
Beth says
This looks so delicious and yummy! I can't wait to make this! My husband is going to love this recipe!
Dannii says
We love cooking fajitas in the slow cooker for an easy weeknight meal.
Pam says
I love cooking in my slow cooker, especially this time of year. Thanks for the great recipe. I'm putting the ingredients on my list right now!
Jess says
A favorite meal made in the slow cooker?! What! This is life changing!
Jenny Walters says
What a taste sensation! My family loves fajitas too so I just love the sound and simplicity of this. Great family food. Thank you so much for sharing it with #CookBlogShare x