Hash Brown Casserole
["1 bag frozen hash brown potatoes", "1/2 onion, chopped", "1/2 stick melted margarine", "1 can cream of mushroom soup", "8 oz. shredded cheese"]
["Layer in order listed in 9 x 13-inch pan.", "Bake at 350\u00b0 covered for 35 to 45 minutes, until bubbly."]
["potatoes", "onion", "margarine", "cream of mushroom soup", "shredded cheese"]