Preheat oven to 350 degrees. Put liners in muffin tin. In a medium mixing bowl, whisk together cocoa, flour, baking soda, baking powder, salt and cinnamon. Set aside.
In a large mixing bowl, mix together oil, vanilla and both sugars. Stir in eggs, bananas and shredded zucchini. Stir well until well combined.
Fold in dry ingredients just until combined. Fold in chocolate chips. Scoop batter into a lined muffin tin and bake in preheated oven for 17-20 mins.
Bake until muffin springs back and/or until a toothpick comes out clean with a few moist crumbs sticking to the toothpick. Remove from oven and let cool completely. Enjoy!