Pat dry the lamb rack and remove silver skin if needed.
Cut lamb rack in half if needed to fit your air fryer and lightly spray with oil.
Combine parmesan cheese, Dijon mustard, olive oil, Worcestershire sauce, minced garlic, fresh herbs, salt, and pepper in a bowl.
Coat the rack of lamb generously with the parmesan crust mixture, pressing it firmly.
Place a perforated parchment sheet or silicone mat in the air fryer basket and spray with oil. Place rack of lamb bone-side down.
Air Fry at 380°F (190°C) for 8 minutes.
Carefully flip the lamb rack, being gentle to avoid breaking the crust.
Air Fry for another 6-10 minutes, or until internal temperature reaches 125°F (52°C) for medium-rare.