Combine all ingredients into a microwave-safe mug, at least 8 oz in size. This makes a small mug cake, so you can use a smaller mug, just make sure it is not less than 8 oz.
Mix all ingredients with a mini whisk until batter is smooth. Cook in the microwave at full power for about 1 minute. The surface of the cake should look done. Let cake cool a few 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.