In a large mixing bowl, combine ground beef and ground pork. Mix well until fully integrated.

Add breadcrumbs, grated Parmesan cheese, chopped parsley, finely chopped onion, minced garlic, and eggs to the meat mixture. Season with salt, black pepper, oregano, and basil. Mix until combined.

Preheat your oven to 375°F (190°C).

Shape the meat mixture into balls, about 1 inch in diameter, creating approximately 24-30 meatballs.

Heat olive oil in a skillet over medium heat. Add meatballs in batches, cooking for 3-4 minutes on each side until browned.

Transfer browned meatballs to a baking dish and pour marinara sauce over them, ensuring they are well coated.

Cover with foil and bake for 20-25 minutes until the sauce is bubbling.

Let the dish sit for 5 minutes before serving.