Potato Casserole

4       C  potatoes, cooked and diced
2      C  White Sauce (recipe to follow)
1/2   C  onion, chopped fine
1/4   t   salt
1/2   t   pepper
12  oz.  low-fat cottage cheese, blended till smooth
1     C    low-fat cheese
1     C   corn flakes, coarsely crushed
1     T   margarine, melted

Combine first six ingredients and pour into a casserole dish sprayed with a non-fat spray.   Top with cheese.  Mix crushed corn flakes with melted margarine and place on top.  Bake at 350 degrees for 1 hour. 

WHITE SAUCE

2    C   skimmed milk
1    T  margarine
1/4  C  flour
salt and pepper to taste

Warm milk in a saucepan over low heat and add margarine.  Add a portion of the heated mixture to the flour in a bowl.  Mix until smooth.  Add the flour mixture to the rest of the milk and margarine mixture and heat until it thickens, stirring constantly.   Season with salt and pepper.