Potatoes au gratin always feature cheese, and is sometimes topped with breadcrumbs for extra crust. Potatoes Dauphinoise traditionally includes no cheese, but relies heavily on its garlic cream sauce. Scalloped potatoes are an Americanized version of Dauphinoise often using a roux based sauce, and 'traditionally' not including cheese. In practice all three are similar enough that the distinctions are often overlooked and the terms are used interchangeably. ** weigh potatoes and revise salt/pepper/garlic amounts.
Preheat oven to 375.F. Mix all ingredients and transfer to a 1 1/2 qt. baking dish.
Cover and bake until bubbling vigorously.
Remove cover and continue baking until browned on top.
Used 1 1/2 lb. Yukon gold potatoes, added 1/4 tsp. ground black pepper, used heavy cream instead of half and half, and used 3 garlic cloves. Baked at 350.F and uncovered after probably only 45 minutes, and the top ended up a very nice golden brown. Previous attempts at cooking this at 375.F have resulted in occasionally burning of the bottom of the dish and slightly under-done potatoes, but the lower temperature seams to do a better job at thoroughly cooking the potatoes without burning anything. Will continue to cook at a lower temp.