Lightly grease the bottom of the mug. In the mug, whisk together dry ingredients, then stir in the mashed banana until everything is wet. Press down with a spoon until even.
Microwave for 1 minute. If still soft, microwave for an additional 30 seconds.
Notes
Click on the time in the instructions to start a timer!If you're following a gluten free diet, make sure your oats are certified gluten free!