Preheat the oven to 180°C (160°C hot air) and grease a cake tin or line with parchment paper.
Melt the chocolate.
Mash up the banana.
Mix the banana with the milk, eggs, oil, vanilla and honey.
Pour a little bit of the mixture into the melted chocolate and stir.
Add the chocolate to the mixture and mix well.
In a separate bowl, mix the flour, cocoa powder, baking soda and baking powder.
Add the wet mixture and mix with a spatula.
Fold in the chocolate chips and pour the batter into the cake tin.
Bake, in the middle of the oven, for ca. 30-40 minutes or until a toothpick inserted in the middle comes out clean.
*If you don't have banana milk at hand, you can add vinegar to regular milk (ratio: ca. 1 tablespoon vinegar to 500 ml milk). Let sit 10 minutes until the milk has started to curdle.
**Depending on the ripeness (sweetness) of the bananas you can add more honey if you like.
***As an alternative you can chop up a piece of chocolate.