hash brown casserole recipe

Ingredients:** - 1 (30-ounce) package frozen shredded hash browns, thawed - 1/2 cup unsalted butter, melted - 1 can (10.5 ounces) condensed cream of chicken soup - 1 small onion, finely chopped - 2 cups shredded cheddar cheese - 1 cup sour cream - 1/2 teaspoon garlic powder - 1/2 teaspoon onion powder - Salt and pepper to taste - 1 cup crushed cornflakes or breadcrumbs - 2 tablespoons butter, melted