- Preheat oven to 400 degrees F. Prep a 9x13 baking dish with cooking spray. 
- Mix ground beef, ground pork, garlic, bread crumbs, buttermilk, onion, eggs, Parmesan cheese, parsley, oregano, salt, and pepper by hand until just combined, careful not to over-mix. 
- Use a 1/4 - 1/3 cup scoop and form meatballs. (I use about 1/3 cup) Place the meatballs in the baking dish. 
- Bake for 20 minutes. 
- Lower oven temperature to 375 degrees F. 
- Place meatballs on a plate. Drain excess grease from the baking dish. 
- Pour about 1 cup marinara sauce in the bottom of the baking dish and spread to cover. 
- Place meatballs in the pan in a single layer. 
- Pour remaining marinara sauce over the top of the meatballs, then sprinkle the shredded Italian cheese blend over the top, so all the meatballs are covered in cheese. 
- Cover with foil and bake for 20 minutes. 
- Remove foil and bake, uncovered, for another 10-15 minutes, until the cheese is bubbly and golden. 
- Garnish with fresh parsley if desired.