Place the bread and milk in a large bowl; let stand for 5 minutes.
Add the beef, pork, onion, garlic, salt, pepper, Italian seasoning, eggs and parmesan cheese to the bowl.
Gently stir everything together until it's just combined. You can add a little more milk, 1 teaspoon at a time, if needed to make the ingredients blend better.
Form the meat mixture into 1 inch balls - do not roll them too tightly!
Preheat the broiler. Coat a sheet pan with cooking spray. Arrange the meatballs on the sheet pan.
Broil for 8-10 minutes or until meatballs are cooked through.
Place the meatballs in a pot on the stove over medium heat along with the marinara sauce and tomato sauce. Stir to combine.
Simmer for 10-15 minutes, or longer if you have the time. Sprinkle with parsley, then serve.