Mix all ingredients together in a bowl until well incorporated.
Fill each mug halfway with brownie batter.
Put both mugs into the microwave and cook on 50% power for two minutes. Then, cook for three more minutes at full power. Once they are done cooking, leave them in the microwave for five minutes.
Enjoy!
Recipe Notes
This will make about 6-8 mug cakes but I recommend only cooking two at once. Cooking times may vary based on microwave wattage. The rest of the batter can be kept in the fridge for a couple days.