In a large bowl, combine beef, egg, oil, parmesan, seasonings, and breadcrumbs. Use your hands to mix the ingredients gently so that you don’t overwork the meat.
Form the meat mixture into golfball size meatballs, burying and completely surrounding a cube of mozzarella in each one.
Pour about 1 to 1-1/2 cups of your pasta sauce into your baking pan. Make sure it covers the bottom. Place meatballs in pan, add more pasta sauce over the top, sprinkle with remaining mozzarella and a bit more parmesan if you have it.
Bake for about 30 minutes or until meatballs are cooked through. Allow the dish to cool long enough for the sauce to stop acting like molten lava.
Scoop meatballs, with some extra cheesy sauce, onto a roll, and go to town.
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