In a bowl, add the brownie mix, egg, oil and flour and beat until a thick mixture forms.
Line the bottom of Air Fryer Basket with parchment paper and then slide inside.
Adjust the temperature of Air Fryer to 370 °F to preheat for 5 minutes.
Make about 12 equal-sized balls from the mixture.
After preheating, arrange 6 dough balls into the prepared Air Fryer Basket in a single layer.
With your fingers, press each dough ball slightly.
Slide the basket into Air Fryer and set the time for 6-8 minutes.
After cooking time is finished, let the cookies cool in the basket for about 2-3 minutes.
Then transfer the cookies onto a wire rack to cool completely before serving.
Repeat with remaining dough balls.