Mix everything except strawberry into a microwave-safe mug using a small whisk until batter is smooth. Stir in strawberry chunks.
Cook for about 1 minute in the microwave. Let cake cool in the mug before eating. Top with whipped cream and strawberries 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.