Grease the Air Fryer Basket with cooking spray and then slide inside.
Adjust the temperature of Air Fryer to 450 °F to preheat for 5 minutes.
After preheating, arrange the tater tots into the greased Air Fryer Basket in a single layer.
Slide the basket into Air Fryer and set the time for 15 minutes.
After cooking time is finished, remove the tater tots from Air Fryer and transfer into a large-sized bowl.
Add feta cheese, tomatoes, olives and onion and toss to coat well.
Lightly grease a baking pan with cooking spray.
Now, place the mixture into the prepared baking pan.
Arrange the baking pan into the Air Fryer Basket.
Slide the basket into Air Fryer and adjust the temperature to 450 °F for 10 minutes.
After cooking time is finished, remove the baking pan from Air Fryer and serve warm.