Preheat oven to 425 degrees
Wash peppers, cut in half, and remove seeds and ribs, then set aside
In a large skillet, brown ground beef and pork in 1 tablespoon olive oil, and add sea salt and pepper
Stir in tomato sauce, Italian seasoning, garlic, onions and ½ cup Parm, and cook until heated through
Remove from heat, and set aside
Line a large baking sheet with heavy duty foil, spread 1 tablespoon olive oil evenly over foil, and on bottoms and sides of peppers, then place peppers, cut sides up, on baking sheet
Fill peppers with meat mixture, and bake for 15 minutes, or until peppers are slightly soft and meat is heated through
Top with remaining Parmesan cheese and mozzarella cheese, bake until cheese is melted
Top with fresh parsley, if desired, and serve