Ingredients
Preparation
Step 2
Peel the potatoes and slice them ⅛-inch thick. Spread about one third of the sauce in the bottom of a well-buttered 3-quart gratin dish at least 2 ½-inches deep, cover it with a layer of potato slices, overlapping the slices slightly, and cover the potatoes with one third of the onions. Sprinkle the onions with one third of the Cheddar and continue to layer the remaining sauce, potatoes, onions, and Cheddar in the same manner. Sprinkle the top with bread crumbs, and dot it with the remaining 1 tablespoon butter, cut into bits.
Step 3
Bake the mixture, covered with foil, in the middle of preheated oven for 20 minutes. Remove the foil and bake the potato mixture for 35 minutes more, or until the top is golden and the potatoes are tender.
