Preheat the oven to 350°F (177°C). Grease a 9x5 loaf pan with butter or cooking spray and set aside. OIr line with parchment paper for easy removal.
In a small mixing bowl, whisk together flour, sugar, cocoa powder, salt, baking soda, baking powder, and espresso powder. Set aside. 2 cups (240 g) all purpose flour 1 cup (200 g) granulated sugar ½ cup (42 g) unsweetened cocoa powder 1 teaspoon fine sea salt 1 teaspoon baking soda ½ teaspoon baking powder 1 teaspoon instant espresso powder
In a large mixing bowl, whisk together eggs, oil (or melted butter), and vanilla extract. 2 large eggs ½ cup (120 ml) neutral-tasting oil 2 teaspoons vanilla extract
With a rubber spatula or wooden spoon, stir in dry ingredients until just combined. Stop mixing once the last of the dry ingredients have been mixed in. The batter will be very thick at this point.
Fold in shredded zucchini and chocolate chips. 2 cups shredded zucchini ⅔ cup (113 g) semi-sweet chocolate chips
Pour into a greased loaf pan, bake for 50-60 minutes or until cooked through and a toothpick inserted in the center comes out clean (or with a few moist crumbs) and top springs back to the touch. Remove from the oven and allow to cool completely in the pan. Remove from the pan, slice and serve!