Microwave for about 1.5 minutes until fluffy and moist but not wet.
Notes
Nutrition: this single-serve mug cake has 4.7 NET carbs.Prep: if your butter is cold simply microwave it in the mug for 15 seconds before adding the other ingredients.To Reheat: microwave for about 10 seconds.To Freeze: place the mug cake in an airtight container and freeze for up to 1 month. Notes on Sweeteners: