Take a mug and wash it properly.
After washing, dry it.
Add white and brown sugar to the mug.
Stir it continuously.
Add melted butter, vanilla essence, and a pinch of salt to the mug and mix them well.
Take a large egg. Separate egg white and egg yolk into two different bowls.
Now pour egg yolk into a mug and mix it well.
Take baking soda and all-purpose flour.
Please put it in the mug and stir it well until a thick paste is formed
Add chocolate chunks to the batter and mix it until it gets combined perfectly.
Now press the batter to make it even.
Further, add cookies over the top layer of the batter.
Now place this mug in a microwave for about a minute.
After baking, removes it from the microwave.
The delicious mug cookie is ready to serve.