Preheat the Oven: Heat your oven to 375°F (190°C) and cover a baking sheet with parchment paper.
Combine Ingredients: In a large mixing bowl, combine the ground beef, ground pork, breadcrumbs, Parmesan cheese, parsley, minced garlic, eggs, salt, and pepper. Mix the ingredients thoroughly until well combined.
Shape the Meatballs: Using your hands, shape the mixture into meatballs, about 1.5 inches in diameter, and place them on the prepared baking sheet.
Bake the Meatballs: Bake in the preheated oven for 25-30 minutes or until the meatballs are browned and cooked through.
Simmer in Marinara Sauce: In a large skillet, heat the marinara sauce over medium heat. Once heated, add the baked meatballs to the sauce and simmer for an additional 10-15 minutes, ensuring they are fully coated.