2 lbs. frozen hash browns
1 can cream of chicken soup
1/4 c. butter
1/2 pt. sour cream
1/3 c. chopped onion (optional)
1 1/2 to 2 c. sharp cheese, shredded

Heat butter with soup. Combine with remaining ingredients and pour in greased casserole. Top with crushed corn flakes and drizzle with a little butter. Bake uncovered for 40-50 minutes at 350 degrees.