How Do You Make Potatoes Au Gratin?
More indulgent than baked potatoes, more elegant than macaroni and cheese, potatoes au gratin are a perfect accompaniment to hamburgers, pork chops, and much more. Preheat oven to 400 degrees. Spray a baking dish with cooking spray. Slice potatoes into 1/4″ slices. Layer half the potatoes to cover the bottom of the baking dish. Slice onion into 1/4″ rings and layer evenly over potatoes. Top with a layer of the remaining potatoes. In a medium sauce pan, melt the butter over medium heat. Stir in the flour until the mixture forms a thick paste. Add a few tablespoons of the half-and-half and whisk until evenly combined. Repeat this process until all half-and-half is incorporated and the mixture is smooth. (If you add too much liquid at once, your sauce may be lumpy.) Whisking constantly, cook the sauce until it just starts to boil. Turn down the heat to medium-low and add the shredded cheese. Stir until the cheese is melted, then add the salt, pepper, and garlic powder. Pour the sauce even
