Combine cocoa mix and flour in a coffee mug.
Add butter, water, and vanilla extract; stir until dry ingredients are wet. Consistency should be the same as brownie batter.
Top with chocolate chips (if you have them).
Microwave on high for 60-90 seconds (I went for 90 for a more cakey texture).
Contents will be hot; let cool before removing from microwave. Enjoy!
