How to make coffee mug cake (easy)

Mug

1 egg yolk

2 tbs of butter

Microwave 15 seconds🕒

All at once

2 tbs of sugar

1/4 tsp of vanilla extract

1/8 tsp of salt

Mix it all

4 tbs of flour

1 tbs of cocoa powder

1 tsp of coffee

1 tbs of milk it could be warm or cold

Almost done... Wait for it

1 minute ⏲

🙌🏻💛

So good

With some milk ☺️🙌🏻