Prepare the meatballs by adding all the meatball ingredients to a large bowl and gently mixing it with your hands and forming it into 2-inch meatballs. I made 18 meatballs. Place the meatballs on the baking sheet and bake them for 20 minutes.
Preheat oven to 375F and move the rack to the top third of the oven. Line a baking sheet with tin foil.
Grate the parmesan cheese (grate the two cups needed, and divide it in half). Grate the mozzarella if you didn't buy an already shredded variety.