Grease the Air Fryer Basket with cooking spray and then slide inside.
Adjust the temperature of Air Fryer to 370 °F to preheat for 5 minutes.
After preheating, arrange the bagel halves into the greased Air Fryer Basket.
Slide the basket into Air Fryer and set the time for 1 minute.
After cooking time is finished, remove the bagel halves from Air Fryer and place onto a plate, cut side-up.
Spread pizza sauce over each bagel half evenly and sprinkle with cheese.
Arrange pepperoni slices over cheese evenly.
Again, arrange the bagel halves into the Air Fryer Basket.
Slide the basket into Air Fryer and set the time for 3 minutes.
After cooking time is finished, remove the bagel halves from Air Fryer and serve warm.