180g (4 pieces, 45g each)/After baking, 4 pieces, 36.5g each
Preheat the oven to 180°C (356°F).
Mash the banana with a fork and place it in a bowl.
Add egg, milk, and melted butter to the mashed banana and mix well.
In another bowl, combine flour, baking powder, sugar, salt, and cinnamon powder.
Pour the banana mixture into the dry ingredients and gently mix until just combined.
Spoon the batter into a muffin pan, filling each cup about 2/3 full.
Bake in the preheated oven for 15-18 minutes.
Let cool before serving.