Mix all ingredients together into an oversized mug. This cake rises a lot so if you don't have a very large mug, I suggest you split the batter into two mugs after mixing. Mix with a small whisk until no lumps remain.
For one oversized mug, microwave for 1 1/2 minutes. Cake should have a dry surface and knife inserted should come out clean. You may want to reduce the time for two smaller mugs.
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.