Get a baking dish that fits snugly into your air fryer. You want it to be as big as possible, while still fitting easily.

Rub the cut garlic clove all over the inside of the baking dish. Add the butter and spread it around the dish so that every surface is coated. Layer the potatoes into the dish, seasoning each layer with salt, pepper and a few thyme leaves. Continue layering until the dish is full.

Mix the cream and milk together, then pour on top of the potatoes. Cover the dish with foil and bake at 160C in the air fryer for 1 hr.

Remove the foil and top with the cheese. Bake for another 20-30 mins until the cheese is golden and bubbling, and the potatoes are completely tender when you insert a knife.