Mix all the ingredients in a bowl and beat until smooth with a mixer.
Pour the finished dough into a mug, it should fill the container to half or a little more.
Microwave for 3.5 minutes at maximum power. Allow to cool slightly, sprinkle with powdered sugar and serve directly in a mug.
A chocolate muffin in 3 minutes in a mug is just a helping hand if guests suddenly come or if you want something sweet especially without turning around. In such a cupcake, you can add a little dried cherries or raisins, serve warm or cold. The ingredients are indicated per serving, so that the cupcake is well pulled out of the mug, grease it with a little butter, you can cook not only in the mug, but also in small pots.