In a large bowl, combine ground beef, ground pork, breadcrumbs, Parmesan cheese, egg, garlic, Italian seasoning, salt, pepper, and parsley until just mixed.
Roll mixture into 1.5-inch meatballs and place on a plate.
Preheat air fryer to 380°F and spray the basket with cooking spray.
Arrange meatballs in a single layer in the air fryer basket, working in batches if needed.
Air fry for 10-12 minutes, shaking the basket halfway through, until meatballs are browned and reach an internal temperature of 160°F.
Let rest for 2-3 minutes before serving with your favorite sauce.