Step 1

Mash banana gently in the skin until soft. Careful to keep banana skin intact.

Step 2

Combine egg, banana, and cinnamon in a small bowl mixing until smooth. I use my immersion blender.

Step 3

Pour the banana egg mixture into a microwave-proof coffee mug.

Step 4

Microwave for 2 minutes on high, add in 30-second increments if needed. The muffin should be firm, not hard.