In a large bowl, combine the ground beef, ground pork, breadcrumbs, Parmesan cheese, parsley, garlic, egg, salt, and pepper.
Mix until everything is well combined.
Shape the mixture into meatballs.
Heat the olive oil in a large skillet over medium heat.
Add the meatballs and cook until browned on all sides.
Pour the marinara sauce over the meatballs.
Cover and simmer for 20-25 minutes, until the meatballs are cooked through.
Serve hot and enjoy!
