Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   6      medium        potatoes
   1      medium        onion -- chopped
     1/4  cup           margarine
   1      tablespoon    flour
   1      teaspoon      salt
     1/4  teaspoon      pepper
   2      cups          milk
   2      cups          sharp cheddar cheese -- shredded
     1/4  cup           fine dry breadcrumbs
                        paprika

Preparation:

1. Prepare potatoes: Wash potatoes. Pare thinly and remove eyes. Cut into enough thin slices to measure about 4 cups. 2. Cook and stir onion in margarine in 2-quart saucepan until onion is tender. Stir in flour, salt and pepper. Cook over low heat, stirring constantly, until mixture is bubbly; remove from heat. Stir in milk 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. Cook uncovered in 325 degree oven 1 hour 20 minutes or in 375 degree oven 1 hour. 3. Mix remaining cheese and the bread crumbs; sprinkle over potatoes. Sprinkle with paprika. Cook uncovered until top is brown and bubbly, 15 to 20 minutes longer.