Preheat the oven to 350
Put liners in a muffin tin.
Stir together flour, cocoa powder, baking soda, baking powder, salt, cinnamon and chocolate chips.
Whisk together the eggs, oil, sugar and vanilla until combined.
Mix in the zucchini.
Gradually add the dry mixture into this mixture until combined.
Fill muffin tins about 2/3 - 3/4 full.
Bake for 22-25 minutes or until a toothpick inserted into the center comes out clean.
Allow to cool for a several minutes in pan before moving to a cooling rack to finish cooling.