Peel and slice the potatoes very thinly. I use a food processor because I like them extra thin.

Rub the garlic clove on the inside of your baking dish.

Arrange the potato slices in the dish. Add the sour cream, salt, pepper, and nutmeg.

Mix everything together. Add the milk.

Add the shredded Swiss cheese and a few pieces of butter.

Bake for 45 minutes at 350°F (180°C). Cover with aluminum foil during baking if needed.