For sauce, cook onion in butter until tender. Stir in flour, salt, and pepper. Add milk all at once. Cook and stir until thickened and bubbly. Stir 3/4 cup shredded American cheese into thickened sauce until melted. Place half the sliced potatoes in greased 1-quart casserole. Cover with half the sauce. Repeat layers. Sprinkle 1/4 cup shredded American cheese over top before serving.
Bake, covered, in a 350 degree oven for 35 minutes. Uncover, bake 30 minutes more or until potatoes are tender. Let stand 5 minutes.
Originally Submitted
1/12/2012
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