Pizza Casserole Special
["1 lb. hamburger", "2 cans pizza sauce", "1 (7 oz.) pkg. elbow spaghetti, cooked", "1 onion, chopped", "1 (10 oz.) pkg. Mozzarella cheese", "4 oz. pepperoni, sliced"]
["Alternate layers.", "Bake at 350\u00b0 for 30 minutes."]
["hamburger", "pizza sauce", "elbow spaghetti", "onion", "Mozzarella cheese", "pepperoni"]