Cooking Directions
Melt butter in heavy saucepan over low heat. Add flour, stirring until smooth. Cook 1 minute, stirring constantly. Gradually stir in milk, cook over medium heat, stirring constantly until thickened and bubbly.
Peel and cut potatoes into 1/4 inch slices. Layer 1/2 of potato slices, onion, ham, salt, pepper, cheese and white sauce in order given in 1 1/2 quart casserole dish. Repeat. Cover and bake at 350 degrees for 2 hours.
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