1 (2 lb.) bag frozen hash browns
1 - 1 1/2 c. cheddar cheese, sharp, shredded
8 oz. sour cream
1/4 lb. butter, melted
1 can cream of chicken soup, undiluted
2 tbsp. onion (opt.)

Combine all ingredients in casserole and bake at 350 degrees for 1 hour.