Cheesy Potato Casserole

Frozen Southern Style Hash Brown Potatoes (2lbs)

Frozen Minced Onions (2 tsbp)

Sour Cream (2 cups)

Cream of Chicken Soup (1 can)

Butter (melted, 1/2 cup)

Salt (1tsp)

Shredded Cheddar Cheese (2 1/2 cups divided (2 and 1/2))