Hash Brown Potato Casserole

1 (8 ounce) carton sour cream
1 can cream of chicken soup
Salt and pepper
1/2 cup chopped onions
1 (2 pound) package frozen hash brown potatoes
10 ounces grated sharp Cheddar cheese
2 tablespoons (1/4 stick) melted margarine

Mix all ingredients together with your hands. Put into a baking dish. Place topping over potato mixture. Bake 1 hour at 350 degrees F.

Topping:
2 cups corn flakes
1/4 cup (1/2 stick) butter, melted

Mix together.