Mix the cocoa powder, flour, sugar, baking powder, eggs, water, and vanilla extract until the batter is smooth. Let rest for 5 minutes.
Preheat the air fryer to 350ºf.
Spray an 8” air fryer safe pie pan lightly with cooking spray.
Add the brownie batter to the pie pan and spread it evenly over pan.
Cook for 10 minutes or until the center is cooked through. Use a toothpick to make sure it’s cooked by piercing the center of the brownie. If the toothpick comes out clean, it’s cooked.
Let the pan cool and remove the whole brownie using a flexible or offset spatula.
Dust the brownie with powdered sugar and cut it into squares or desired shapes. The chef gets to enjoy the uneven bits!
Serve and enjoy!