Preheat your air fryer to 380ºF (193ºC).
Make the dry rub. Mix the garlic powder, onion powder, paprika, dried thyme, rosemary, salt, and pepper in a small bowl.
Season the turkey tenderloins. Pat the tenderloins dry with a paper towel. This’ll remove any excess moisture. Next, rub the turkey with olive oil, ensuring they're evenly coated. Then, sprinkle the spice mixture over the tenderloins, ensuring they're fully seasoned.
Air fry the turkey tenderloin. Place the seasoned turkey in the air fryer in a single layer. Set the air fryer’s temperature to 380ºF (193ºC) and cook for 20 - 25 minutes. Flip the tenderloin halfway through.
Check if the turkey is cooked thoroughly. Insert an instant-read thermometer in its thickest part. The internal temperature ought to reach 165ºF (74ºC).
Once done, remove the turkey tenderloin from the air fryer and let them rest for a couple of minutes before serving.
Serve and enjoy your air fried turkey tenderloin. Slice the turkey tenderloins and serve with your favorite sides, like roasted vegetables or mashed potatoes.