Grandma Rhea's Potato Casserole

8 c. potatoes, cooked and shredded or 1-2 lb. pkg. frozen, shredded hashbrowns
2 cans cream of chicken soup
2 c. sour cream
1/2 c. onion, finely diced
2 c. grated cheese
corn flake crumbs

Mix all but cornflake crumbs together in a large mixing bowl.  Put into a greased 9x13 baking dish.  Top with cornflake crumbs.  bake uncovered at 350 degrees for 1 hour or until bubbly and delicious.