Combine all ingredients into oversized mug. Stir with a small whisk or fork until batter is smooth.
Microwave for 1 1/2 minutes. If cake is not done, microwave for an additional 30 seconds. Serve while warm. Top with whipped cream if desired.
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.