Air Fryer Chocolate Mug Cake

0 In a microwave-safe mug, whisk together the flour, sugar, cocoa powder, baking powder, and salt.
1 Add the milk, vegetable oil, and vanilla extract to the mug. Mix until well combined and smooth.
2 If using, sprinkle chocolate chips or chopped nuts on top of the batter.
3 Preheat your air fryer to 320°F (160°C).
4 Place the mug into the air fryer basket and cook for 10-12 minutes, or until a toothpick inserted in the center comes out clean.
5 Remove the mug from the air fryer and let it cool for a few minutes before enjoying.