In a medium bowl, whisk together flour, cocoa powder, baking powder, and salt.
In a separate bowl, mix granulated sugar, brown sugar, and oil until smooth.
Add eggs and vanilla extract to the sugar mixture and beat until combined.
Gradually add the dry ingredients to the wet ingredients and mix until a dough forms.
Chill the dough in the refrigerator for at least 2 hours.
Preheat your air fryer to 350°F (175°C).
Roll dough into 1-inch balls and coat each ball thoroughly in powdered sugar.
Place the cookies in a single layer in the air fryer basket, ensuring they don't touch.
Air fry for 8–10 minutes or until the cookies are crinkled and set.
Let the cookies cool on a wire rack before serving.