1 pkg. frozen hash browns
1 c. chopped onions
1 can cream of chicken soup
8 oz. sour cream
3 c. sharp Cheddar cheese (grated)
1 stick melted butter

Mix all of preceding ingredients. Melt 1 stick of butter and pour over casserole (13x9) dish. Bake at 350 degrees for 30 to 45 minutes.