Scrub and rinse the sweet potatoes to remove any dirt and then dry.
With a small knife, pierce each sweet potato at many places.
Spray each sweet potato with cooking spray and sprinkle with salt.
Grease the Air Fryer Basket with cooking spray and then slide inside.
Adjust the temperature of Air Fryer to 400°F to preheat for 5 minutes.
After preheating, arrange the sweet potatoes into the greased Air Fryer Basket in a single layer.
Slide the basket into Air Fryer and set the time for 35-45 minutes.
After cooking time is finished, remove the sweet potatoes from Air Fryer and serve.