Italian Meatballs

In a small bowl, stir bread crumbs with milk until evenly combined. Let sit 15 minutes, or while you prep other ingredients. In a large bowl, use your hands to combine beef, pork, sausage, onion, and garlic. Season with salt and pepper, then gently stir in bread crumb mixture, eggs, Parmesan, and parsley until just combined. Form mixture into 1" balls. In a large high-sided skillet over medium heat, heat oil. Working in batches, sear meatballs on all sides to develop a crust. Set meatballs aside, reduce heat to medium-low, and add sauce to skillet. Bring sauce to a simmer then immediately add meatballs back to skillet. Cover and simmer until cooked through, about 8 minutes more.