Classic dauphinoise potatoes baked in a creamy garlic sauce and finished with Gruyere cheese. dauphinois is a French dish of sliced potatoes baked in milk or cream, using the gratin technique, from the Dauphiné region in south-eastern France. There are many variants of the name of the dish, including pommes de terre dauphinoise, potatoes à la dauphinoise and gratin de pommes à la dauphinoise.