Look for a recipe that includes milk. That seems to be the key to good Italian meatballs. My BIL owned a restaurant in NYC for over30 years. His chef's recipe includes breadcrumbs, egg, milk, a good beef (not chuck) a bit of onion, parsley and a dash of oregano. Work the mixture with your hands. They should be slightly moist. Make large meat balls. Place on a baking sheet (spray first). Bake for about 30 minutes in a 350 oven. Place in sauce to finish cooking.