Potato Casserole

1 21oz bag hash brown potatoes
1/2 onion
1 can cream of chicken soup
1 16oz sour cream
1/2 cup butter - melted
1 cup cheddar cheese
cornflakes

Mix all ingredients except cornflakes. Butter 9 x 13 pan. Top with
cornflakes. Bake at 350 degrees for 45 minutes.