Mix all ingredients in an oversized mug with a small whisk until batter is smooth. Microwave for about 1 1/2 minutes. Check the bottom of cake to see if it's cooked all the way through. If not, microwave for an additional 30 seconds. It's okay if the top remains a little gooey. Careful not to overcook the mug cake.
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.