Preheat the oven to 200C.
In a small bowl, mix the warm coffee with the flax meal. Let sit for about 10 minutes.
In a large bowl add the coconut oil, applesauce, and sugar. Mix until well incorporated. Continue mixing.
Then stir in the flax egg, vanilla extract, melted chocolate, and mix until you achieve a homogeneous composition.
Using a spatula stir in the flour, cocoa powder, baking powder, and salt.
Grease a square baking tray. Transfer the batter to the baking dish, flat it with a spatula and lay in banana halves, sprinkle with brown sugar, and bake for about 40 minutes until all set and caramelized on top.
Let cool for about 30 minutes.