Preheat your oven to 350°F (175°C).
In a mixing bowl, combine the chopped carrot, chopped zucchini, maple syrup, banana, avocado oil, and flax if you're using it instead of eggs. Mix everything together until it's well blended.
In a separate bowl, whisk together the flour, cocoa powder, baking powder, and baking soda.
Gradually incorporate the dry ingredients into the wet mixture, stirring until just combined.
Spoon the batter into a muffin tin that is lined with paper liners or greased.
Bake for 15-20 minutes, or until a toothpick inserted into the center comes out clean.
Let the muffins cool before serving.
