Combine the ingredients. Preheat the oven to 400 degrees. Combine the ground beef, pork, eggs, Italian breadcrumbs, parmesan cheese, grated onion, garlic, parsley, basil, salt, and pepper in a large mixing bowl. Use your hands to mix the ingredients until it is well combined.
Stuff and bake the meatballs. Use a cookie scooper or a tablespoon to measure the meatballs out. Flatten the meatballs into a patty, then place the mozarella pearl in the center. Roll the meat around the cheese, then place the meatballs on the parchment paper lined baking sheet. Bake the meatballs for 20 minutes.
Serve. Serve the meatballs with your favorite pasta sauce and pasta. Mangia!