Grease a baking pan with cooking spray. Set aside.
For filling: in a bowl, add all ingredients and mix until well combined.
For topping: in another large bowl, mix together the flour, baking powder, and sugar.
Add the milk and butter and mix until a crumbly mixture forms.
In the bottom of the prepared baking pan, place the blueberries mixture and top with the flour mixture evenly.
Slide the Air Fryer Basket inside and adjust the temperature to 320 °F to preheat for 5 minutes.
After preheating, arrange the baking pan into the Air Fryer Basket
Slide the basket into Air Fryer and set the time for 20 minutes.
After cooking time is finished, remove the baking pan from Air Fryer and place onto a wire rack to cool for about 10 minutes before serving.