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.
Spray each burger patty with cooking spray evenly.
After preheating, arrange the patties into the greased Air Fryer Basket in a single layer.
Slide the basket into Air Fryer and set the time for 10 minutes.
While cooking, flip the patties twice.
After cooking time is finished, remove the patties from Air Fryer and place the patties onto a plate.
Place one lettuce leaf over the bottom half of each bun, followed by one patty.
Top with onion, tomato and remaining lettuce leaves.
Cover each with bun top and serve.