Potato Cheese Casserole

6 med potatoes
1/4 cup margarine
1 can cream of chicken soup
1 pt sour cream
2 cup grated sharp cheddar cheese
2 tbsp margarine
1/3 cup chopped onion
Crushed corn flakes

Boil potatoes until they are slightly firm.  Cool slightly, cut into even slices.  Mix the 1/4
cup margarine with the soup, blend in sour cream, onions and cheese.  Layer potato and soup
mixture in casserole.  Mix crushed corn flakes with 2 tablespoons margarine, melted.
Sprinkle over top.  Bake in 350* oven for 45 minutes or until bubbles.