• Preheat your air fryer to 320°F (160°C).
• Grease a 6-inch cake pan with cooking spray or line it with parchment paper.
• In a large bowl, sift together the flour, sugar, cocoa powder, baking powder, baking soda, and salt.
• Stir in the hot water until the batter is smooth.
• In a separate bowl, whisk together the vegetable oil, buttermilk, egg, and vanilla extract.
• Gradually add the wet ingredients to the dry ingredients, mixing until well combined

Pour and Cook:

• Pour the batter into the prepared cake pan.
• Place the pan in the preheated air fryer basket and cook for 25-30 minutes or until a toothpick inserted in the centre comes out clean.
• Allow the cake to cool in the pan for 10 minutes before transferring it to a wire rack to cool completely.
• Dust with powdered sugar or frost with your favourite icing before serving.