Preheat your oven to 350°F (177°C) and prepare a 9×5-inch or an 8×4-inch loaf pan with oil or nonstick spray.
Grab a large bowl, mix the dry ingredients: flour, espresso powder, cocoa powder, baking powder, baking soda, and salt. Add the chocolate chips to ensure an even distribution of chocolatey goodness in each slice, then set the bowl aside.
In a separate bowl, fold the wet ingredients—eggs, yogurt, oil, sugar, and vanilla extract—until smooth and glossy. This mixture adds moisture and a bit of tang that balances the flavors.
Gently combine the wet ingredients with the dry ingredients, stirring just until the batter comes together. Toss in the shredded zucchini to keep the batter thick.
Pour the batter into your prepared pan and bake it for 45 to 55 minutes, checking around the 45-minute mark. Halfway through, cover it loosely with aluminum foil to prevent over-browning.
Let the bread cool in the pan for an hour, and when it’s still warm to the touch, press extra chocolate chips on top for a beautiful finish. Once mostly cooled, remove it from the pan and let it finish cooling on a wire rack.
Slice the chocolate-loaded zucchini bread and enjoy!