For the chocolate mug cake from the air fryer, mix all ingredients in a large, ovenproof cup. You can divide the batter into two small cups if desired.
Bake the cup with the mixed batter in the hot air fryer at 170 ° C for about 10-15 minutes. Take it out with oven gloves. Depending on the air fryer, extend the baking time if necessary.
Serve the chocolate mug cake immediately.
Tip: The mug cake also tastes wonderful if you refine it with spices such as cardamom, ground cloves or gingerbread spices, nuts or pieces of fruit.