Preheat the oven to 200℃ (180° Fan/ Gas 6/ 400℉).
Place the double cream, milk, garlic cloves, thyme leaves, salt and pepper in a large saucepan. Bring to a simmer and heat for 10 minutes.
600 ml Double Cream, 200 ml Whole Milk, 5 Garlic Cloves, 2 teaspoon Thyme Leaves, ½ teaspoon Salt, ¼ teaspoon Black Pepper
Add the sliced potatoes and cook for 6 minutes.
1 kg Maris Piper Potatoes
Using a slotted spoon, spoon the potatoes into a 30 x 20cm baking dish.
Discard the whole garlic cloves then pour the cream mixture over the potatoes. Sprinkle over the grated Parmesan.
75 g Parmesan
Bake in the oven for 40-50 minutes until golden and bubbling.