Peel the banana and cut it into small pieces.
In a bowl, add the banana, egg, sugar, and milk, and mix well.
Sift the flour and baking powder, then add them to the batter and mix.
Add the chocolate chips and mix evenly.
Melt the butter in a pan, then pour the batter on and cook over low heat.
When one side is cooked, flip it over and cook the other side.
Let the finished bread cool, then cut it into pieces for serving.