2 cups diced cooked potatoes
2 tablespoons grated onion
½ cup grated American Cheddar cheese
2 tablespoons butter
½ cup milk
More grated cheese for covering
In a buttered baking dish put a layer of diced potatoes, sprinkle with onion and bits of butter. Next, scatter on a thin layer of cheese and alternate with potatoes, onions and butter. Stir milk, egg, salt and pepper together and pour it on the mixture. Top everything with plenty of grated cheese to make it authentically American au gratin.
Bake until firm in moderate oven, about ½ hour.
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