recipe for funeral potatoes

Ingredients 1 package (30 oz) frozen hash browns, thawed 1 can (10.5 oz) condensed cream of chicken soup 2 cups sour cream 1/2 cup unsalted butter, melted 1 small onion, finely chopped 2 cups shredded cheddar cheese Salt and black pepper to taste 2 cups cornflakes, crushed 1/4 cup unsalted butter, melted (for topping)