Step 1

Combine all ingredients in an oversized mug or heatproof bowl. Whisk with a fork until smooth (batter will be thick). Microwave on high for 1 to 1-1/2 minutes (Start with 1 minute, then check for doneness and cook for more time, if necessary). A toothpick inserted into cake center should come out clean. Let cool slightly before eating.

Step 2

Enjoy!