Lightly grease a baking sheet with cooking spray. Set aside.
In a large bowl, mix together the flour and sugar.
Add the butter and mix until a smooth dough forms.
Cut the dough into 10equal-sized fingers.
With a fork, lightly prick the fingers.
Arrange fingers into the prepared baking sheet in a single layer.
Slide the Air Fryer Basket inside and adjust the temperature to 355 °F to preheat for 5 minutes.
After preheating, arrange the baking sheet into the Air Fryer Basket.
Slide the basket into Air Fryer and set the time for 12 minutes.
After cooking time is finished, remove the baking sheet from Air Fryer and place onto a wire rack to cool for about 5-10 minutes.
Invert the shortbread fingers onto wire rack to completely cool before serving.