Preheat oven to 350 degrees F.
Spray a loaf pan with non-stick cooking spray.
In a medium bowl, mash bananas until smooth (some lumps can still be present). Add eggs and beat together with banana using a whisk or fork. Mix in grated zucchini, vanilla and maple syrup.
In a separate bowl, mix together the almond flour, coconut flour, cinnamon, cocoa powder, baking soda, and salt until all lumps are gone.
Pour dry ingredients into wet and mix until combined. Add the chocolate chips and fold into the mixture.
Bake for 55-60 min or until a toothpick inserted comes out clean.