2 lbs. hash brown potatoes, thawed
1 onion cut up and fried in butter
1 can cream of chicken soup
1 can cream of mushroom soup
2 c. sour cream
6 oz. shredded cheddar cheese

Mix all ingredients; place in 9 x 13 inch pan. Crush cornflakes on top; add pats of butter. Bake at 350 degrees for 1 1/2 hours.