Originally from allrecipes.com - changed very slightly.
1 (30 oz.) package frozen hash brown potatoes, thawed
1/2 cup butter, melted
1 teaspoon salt
1/2 teaspoon fresh ground black pepper
1 sm.-med. finely chopped onion
1 (10.75 ounce) can condensed cream of chicken soup
2 cups shredded Sharp Cheddar cheese
Preheat oven to 350 degrees F. Spray one 9x13 inch pan with non-stick cooking spray.
In a large bowl, combine the potatoes, butter, salt, pepper, onions, soup and cheese and pour into prepared pan or dish. Bake uncovered for 35 minutes or until lightly browned and bubbly.