Now to start making the meatballs: In a large bowl combine the onion, parsley, parmesan, bread crumbs, egg, ketchup, garlic, salt and pepper. Mix those ingredients together with a large spoon and then add the meat and continue to blend the ingredients. With your hand form meatballs that are approx the size of a golf ball. Once you have made all the meatballs place them on a baking sheet that you have lined with parchment paper. Then with your thumb, make a small indentation into each meatball and put a cube of the mozzarella cheese. Then continue to cover the mozzarella with the meatball and roll until round. These will cook in the over for 15 minutes on 400 degrees.

While the meatballs are cooking, bring a large pot of water to boil and cook your pasta. Once the meatballs are done baking in the oven, remove them and add them to the drained pasta and add the sauce on top. Garnish with extra chopped parsley and parmesan cheese.