1 lb. hamburger
1 med. onion, chopped
8 oz. egg noodles, cooked
1 lg. (32 oz.) jar spaghetti sauce
1 can Cheddar cheese soup

Brown meat and onion. Stir all ingredients together. Pour into 9x13 inch greased pan. Sprinkle with 8 oz. Mozzarella cheese. Bake at 350 degrees for 45 minutes.