Combine the ground beef, breadcrumbs, egg, Italian herb seasoning, half of the Parmesan cheese, minced garlic, chopped onion, salt, and pepper in a mixing bowl. Mix until the ingredients are evenly distributed.
Shape the mixture into a loaf about 6 inches long and 3 inches wide.
Sprinkle the remaining Parmesan cheese over the top and sides of the loaf, pressing lightly so it sticks.
Place the loaf in the air fryer basket.
Cook at 375 degrees for 20 to 25 minutes until the internal temperature reaches 160 degrees and the Parmesan edges are golden and crisp.
Remove the meatloaf and let it rest for 5 minutes before slicing.