Preheat oven to 350°F and grease a mini muffin tin.
In a large bowl, whisk together the dry ingredients: both flours, cocoa powder, baking soda, baking powder, and salt.
In a separate bowl, mash the banana, then combine with the maple syrup, egg, vanilla, and avocado oil. Fold in the grated zucchini.
Add the wet ingredients to the dry and stir until just combined. Fold in the chocolate chips.
Divide the batter evenly among the muffin cups.
Bake for about 13 minutes, or until a toothpick inserted in the center comes out clean.
Cool for 5–10 minutes before removing from the pan. Enjoy!