TIP: The key to good meatballs is the right combinations of bread crumbs, liquid and egg measurements. If any of them are off, your meatballs will be either too soft and fall apart or, something you could break a window with. Make sure not to over mix the meat. If the meat feels too soft and squishy, than the meatballs will probably fall apart. So adjust ingredients accordingly. Remember, bread crumbs soaked in milk, contribute to the softness of the meatballs. The egg is what holds them together so they don't fall apart during cooking.