Preheat the oven to 350F (180°)Combine the mashed bananas, coconut oil, agave and the chia seed water mixture into a mixing bowl. Mix until well combined.Stir in the flour and the baking powderTake about â…“ of the batter and mix it with the coconut milk, the cacao powder, chopped chocolate, cinnamon and vanilla.Pour the plain batter into a lined loaf tin and top with the chocolate half. Take a knife and “cut†trough the batter a couple of times to create a marbled effect.Top with sliced bananasBake for 35-40 minutes or until a toothpick stuck into the middle comes out clean.Let it cool for a bit before slicing.Serve warm with homemade Nutella