Preparation / Directions:
Heat oven to 375. Cook and stir onion in butter in 2-quart saucepan until onion is tender. Stir in flour, salt and pepper. Cook over low heat, stirring constantly, until mixture is smooth and bubbly; remove from heat. Stir in half-and-half and 1 1/2 cups of the cheese. Heat to boiling, stirring constantly. Boil and stir 1 minute. Place potatoes in ungreased 1 1/2-quart casserole. Pour cheese sauce on potatoes. Bake uncovered until top is brown and bubbly, 1 1/4 to 1 1/2 hours. Mix remaining cheese and the bread crumbs; sprinkle over casserole. Raise temperature to broil and broil 3 to 4 inches from heat until top is crusty and light brown, about 4 minutes. Tip: Broiling step can be omitted if you wish. Bake casserole uncovered 1 hour; sprinkle with cheese-crumb mixture. Bake until top is brown and bubbly, 15 to 30 minutes.
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