Mix everything thoroughly with a teaspoon - if the batter is too thick, add a little more milk.
Place the mug with the cake in the microwave and heat on the highest power for about 1.5-2 minutes.
You can also add some fruit jelly to the mug before eating - I used Forest Fruits jelly from Allnutrition.
Uwagi
I provide the calorie count for the products I used. By changing erythritol to another "sweetener", you will also change the calorie count of the dessert.Enjoy!