Combine all ingredients into an oversized microwave-safe mug. Mix with a whisk until batter is smooth. The batter will be quite thick.
Microwave for 1 minute. Let the brownie cool and set for about 15-30 minutes before eating.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.