Preheat the air fryer to 400°F.
In a large bowl, combine ground beef, breadcrumbs, milk, egg, minced garlic, Parmesan cheese, salt, black pepper, and Italian seasoning. Mix until just combined, being careful not to overwork the meat.
Form the mixture into 1.5-inch meatballs, yielding about 16 to 20 meatballs.
Place the meatballs in the air fryer basket in a single layer, ensuring they do not touch for even cooking.
Cook in the air fryer for 12 minutes, or until the meatballs are browned on the outside and reach an internal temperature of 165°F.
Remove the meatballs from the air fryer and let them rest for a few minutes before serving.