1 (30 oz) package frozen shredded hashbrowns, thawed
1 pound breakfast sausage, cooked and crumbled
1 small onion, finely diced
1 cup sour cream
1 can (10.5 oz) condensed cream of chicken soup
2 cups shredded cheddar cheese
1/2 cup melted butter
Salt and pepper to taste
1/2 cup crushed cornflakes (optional, for topping)