Funeral Potatoes

Bahan-bahan (8 porsi)

• 1 (32 ounce) bag diced hash brown potatoes (thawed)
• 4 tablespoons butter
• ½ onion (finely chopped)
• 1½ cups sour cream
• 2 (10.5 ounce each) cans condensed cream of chicken soup
• 2½ cups shredded cheddar cheese (divided)
• 1½ cups cornflakes
• 4 tablespoons butter (melted)