Cracker Barrel's Hash Brown Casserole

2 pounds frozen, country-style hash browns
salt , to taste
pepper, to taste
2 cups sour cream
1 can cream of chicken soup
1/2 cup butter
1/2 cup chopped onion
2 cups grated cheddar cheese

Place potatoes in a greased 9" X 13" pan. Season with salt and pepper. In a bowl, combine minced onions, sour cream, and cream of chicken soup. Pour soup mixture over potatoes; sprinkle with cheddar cheese and melted butter. Bake in 350 degree oven for 45 minutes, or until all is completely warm, and the cheese begins to melt.