Grease the Air Fryer Basket with cooking spray and then slide inside.
Adjust the temperature of Air Fryer to 360 °F to preheat for 5 minutes.
In a bowl, add the Brussels sprout, oil, salt, and black pepper and toss to coat well.
After preheating, arrange the Brussels sprout into the greased Air Fryer Basket in a single layer.
Slide the basket into Air Fryer and set the time for 15 minutes.
While cooking, shake the basket once halfway through.
After cooking time is finished, remove the Brussels sprout from Air Fryer and serve.