What has somebody done to potatoes if you are having them au gratin?

1. Sliced or diced: The potatoes are cut into thin slices or small cubes.

2. Layered: The potato slices/cubes are layered in a baking dish, often with other ingredients like cheese, cream, or onions.

3. Covered with a creamy sauce: A béchamel sauce or a mixture of cream and cheese is poured over the potatoes.

4. Sprinkled with cheese: The top is generously covered with grated cheese.

5. Baked until golden and bubbly: The dish is baked in the oven until the potatoes are tender and the cheese is melted and browned.

So, in essence, the potatoes have been sliced, layered, covered in a creamy sauce, and baked with cheese. This creates a delicious and comforting dish!