Preheat the oven to 350f and set the rack to the middle level. Spray, grease, or line with parchment paper a 9x5 inch loaf pan and set aside.
In a large bowl combine the flour, cocoa powder, espresso powder, baking soda, baking powder, salt, cinnamon, sugar, and chocolate chips.
In a separate large bowl whisk together the eggs, Greek yogurt, vanilla, oil, then add the zucchini and whisk to combine.
Add the dry ingredients to the wet and mix just until combined taking care to not overmix.
Pour the batter into the loaf pan. For a better look, sprinkle some extra chocolate chips or chunks on top of the loaf before baking.
Place in the oven and bake for 45-55 minutes or until a toothpick inserted in the center comes out clean.
Allow the zucchini bread to cool in the pan for 10-15 minutes before removing. Once removed let the bread continue to cool on a wire rack for at least 1 hour before eating.