Preheat oven to 350 degrees
Beat together the eggs, oil, sugar, vanilla, and cocoa powder
Add grated zucchini to wet ingredients
Sift together flour, baking powder, cinnamon, baking soda and salt.
Pour the dry ingredients with the zucchini mixture. Stir to combine.
Spray a bread loaf pan with non stick spray and dust with cocoa powder
Pour mixture into loaf pan
Place in oven and bake for one hour
Test with a tooth pick and it if pulls out clean, the bread is done. If there is a little wet ingredients still on toothpick, bake for another 5 minutes.
Let cool in pan for 5 minutes
Run a knife around the edge of the pan to release the bread. Carefully turn bread out of pan on to a cooling rack and cool for 10 minutes before slicing.