01 -
Set oven to 410°F (210°C) and line a large baking sheet with parchment paper.
02 -
In a large bowl, combine ground beef, ground pork, breadcrumbs, whole milk, egg, grated Parmesan, parsley or basil, salt, black pepper, diced onion, and minced garlic. Mix gently by hand until just incorporated.
03 -
With lightly oiled hands, shape meat mixture into golf ball-sized meatballs, approximately 1.5 inches in diameter. Arrange evenly spaced on the prepared baking sheet.
04 -
Coat meatballs lightly with olive oil or cooking spray. Bake in preheated oven for 12 minutes, or until nearly cooked through. Broil under high heat for 2 additional minutes to achieve a browned exterior.
05 -
While meatballs bake, heat olive oil in a large skillet over medium heat. Sauté onion for 2-3 minutes until translucent. Add garlic and cook for 1 minute. Stir in crushed tomatoes, tomato paste, oregano, basil, red pepper flakes, salt, and black pepper. Simmer for 10 minutes, stirring occasionally. Add sugar or baking soda to balance acidity.
06 -
Transfer baked meatballs and any collected juices into the simmering marinara sauce. Gently simmer uncovered for 2-3 minutes to infuse flavors, ensuring meatballs remain tender.
07 -
Serve meatballs hot, garnished with additional parsley or basil if desired. Pair with cooked pasta, bread, or mashed vegetables.