If you have any leftover meatball mixture, or you don't need to stuff six peppers at once, you can simply turn that into meatballs. Use a cookie scoop to measure out enough mix for a meatball. Roll it into a ball and place it on a cookie sheet. Bake it at 350 F for about 20 to 25 minutes. Since these will be done before the Meatball Stuffed Peppers, you can serve them as an appetizer before the main course.