These mozzarella stuffed meatballs are a must-make for cheese lovers each meatball has gooey melted cheese inside this easy cheese stuffed meatballs recipe uses my baked italian meatballs recipe as a base for meat mixture with the addition of mozzarella cheese balls inside fresh mozzarella balls are perfect for stuffing into meatballs fresh mozzarella cheese balls come in different sizes, buy the ones labeled 'ciliegine' (1/3 oz 'cherry size'). this size of mozzarella balls is perfect for fitting inside the meatballs and still allowing for a layer of meat to encase it. you can use any meatball recipe for the.