Place the mug with the cake in the microwave and bake for about 2 - 2.5 minutes (depends on your microwave's power - I baked the cake in a 900W microwave for 2.5 minutes) - check with a skewer to see if the cake is ready.
After removing, let it cool slightly for 2 minutes and eat while still warm.
A glass has a capacity of 250 ml.See the notes below the recipe for possible substitutions or preparation tips. The recipe video is in Polish, but you can watch it to see the step-by-step process.