Finely chop the banana.
Melt the chocolate using a double boiler.
In a bowl, mix the banana with flour, sugar, milk, baking powder, and salt.
Add the melted chocolate and eggs to the batter and mix well.
Pour the batter into a mold.
Bake in a preheated oven at 180°C (356°F) for 20 minutes.
Once cooled, garnish with chocolate syrup or banana slices as desired.