Put all ingredients in a mixing bowl. Mix everything well until you get a creamy mixture. Pour the finished mixture into 1 large or 2 small cups. If you like, you can also prepare the dough in a large cup. The batter should fill the cup about halfway through.
Then place in the microwave without the lid and bake for 2:30 minutes at 750 W in the microwave. If you prefer the core liquid, you can only leave the cake in the microwave for about 2 minutes.
Garnish the cake with chocolate sprinkles or a dollop of cream and serve immediately.