1 lb. ground beef
12 oz. egg noodles
1 chopped onion
1 (15 oz.) jar pizza or spaghetti sauce
1 lg. pkg. mozzarella cheese
1 pkg. pepperoni

Preheat oven to 350 degrees. In a large skillet brown ground beef and onion; drain fat. Add cooked noodles and sauce. Stir to blend. In a 2 quart casserole, layer noodle mixture alternately with cheese and pepperoni, ending with cheese. Bake uncovered for 20 minutes.