Measure out all the necessary ingredients.
Peel the banana, break into pieces and place in a blender.
Add flour, sweetener, cocoa, baking powder and egg to the banana.
Mix all ingredients in a blender.
Place the finished mixture into molds.
Place the molds in the oven. Bake at 180°C for 20-30 minutes.
Decorate the finished muffins with hot chocolate.