In a large mixing bowl, combine the ground beef, ground pork, bread crumbs, Parmesan cheese, chopped parsley, chopped sun-dried tomatoes, chopped garlic, chopped onion, eggs, milk, Worcestershire sauce, dried oregano, dried basil, salt, and black pepper. Use your hands to gently mix the ingredients until evenly combined.

3. Shape the meatloaf
Place the meat mixture on the prepared baking sheet and shape it into a loaf approximately 9 inches long and 5 inches wide. Make sure the loaf is evenly shaped and pressed to prevent it from falling apart during baking.

4. Bake the meatloaf
Place the meatloaf in the preheated oven and bake for 45 to 55 minutes, or until cooked through and an internal temperature of 160°F (71°C). Spread the marinara sauce evenly over the top of the meatloaf during the last 10 minutes of baking for added flavor.

5. Rest and Serve
Once the meatloaf is fully cooked, remove it from the oven and let it rest for 5 to 10 minutes before slicing. This allows the juices to redistribute, resulting in a juicy and flavorful meatloaf. Serve slices of the Italian meatloaf alongside your favorite side dishes, such as roasted vegetables, mashed potatoes, or a crispy salad.