In a mixing bowl, combine the ground beef, breadcrumbs, Parmesan cheese, chopped parsley, egg, minced garlic, oregano, basil, salt, and pepper.
Mix the ingredients with your hands until just combined; do not overmix to keep the meatballs tender.
Shape the mixture into meatballs, about 1 inch in diameter. You should get around 20 meatballs.
Preheat the air fryer to 375°F (190°C) for about 5 minutes.
Place the meatballs in the air fryer basket in a single layer, ensuring they do not touch for even cooking.
Cook the meatballs in the air fryer for 10-12 minutes, or until they are browned on the outside and cooked through (internal temperature should reach 160°F or 71°C).
Remove the meatballs from the air fryer and let them rest for a couple of minutes before serving.
Serve with marinara sauce if desired.