Preheat the oven to 350 degrees.Grease a donut tin with cooking spray. Set aside.Slice the ends off of the zucchini and then slice it halfway lengthwise. Spiralize, using Blade D. In a medium bowl, add in the coconut flour, tapioca flour, baking soda, salt, cinnamon, nutmeg and cacao.In another medium bowl, mix the eggs, maple syrup, vanilla extract, almond milk, coconut oil and banana together.Add the dry ingredients to the wet and add in the zucchini and stir until the batter is smooth.Pour the batter into the donut tins and bake for 30 minutes or until a toothpick comes out clean when you pierce the center of a donut and the donut is firm and hardened on the outside, like a donut!Pop the donuts out carefully.Place a small saucepan over medium-high heat and add in the chocolate chips. Let heat, stirring frequently, until fully melted.Place the donuts on a piece of parchment paper and drizzle over with chocolate. Dust with coconut flakes. Enjoy immediately or let stand for 20 minutes for the chocolate to harden.