Preheat the oven to 180ºC/325ºF and spray a loaf tin with non-stick spray
Using an electric mixer, mix together the bananas, coconut oil, maple syrup, vanilla essence and almond milk.
Add the remaining ingredients, except for ¼ cup of chocolate chunks, and gently mix until just combined. If you want a marbled effect, stir in the cocoa powder at the end.
Pour the mixture into the prepared tin and top with the remaining chocolate chunks.
Bake for 50-60 minutes or until a fork inserted comes out clean.
Allow to cool slightly before serving. Best served warm with a little nut butter.