Heat the butter in a bowl in the microwave at approx. 900 watts for approx. 1 minute.
Add the remaining ingredients and beat with the whisk to a homogeneous mass. Divide the dough into 2 small cups and do not fill them completely with dough.
Bake in the microwave on the highest setting at approx. 900 watts for 2 minutes. Then let it stand for another 30 seconds and only then take it out of the microwave.