In a large mixing bowl combine ground beef, ground pork, parmesan cheese, eggs, salt, pepper, garlic, basil, parsley and oregano.
Add bread crumbs 1/2 cup at a time until mixture is not too wet and can be formed into balls easily.
Form mixture into 12 balls using your thumb to press a hole into the center (You can also use a cookie scooper to make uniformed balls).
Insert a piece of mozzerella into the hole and close the hole by pinching the meat mixture together around it.
Heat a large saute pan over medium heat and drizzle olive oil into pan. Add meatballs and cook until just browned. Using a slotted spoon, transfer meatballs into a slow cooker. (If prefered you can bake meatballs in a deeper cookie sheet at 350 for about 30 min).
Pour red sauce over the meatballs and cook on LOW for approximately 5 hours.