Preheat the oven to 350 degrees. In a large bowl, whisk together the brown sugar, granulated sugar, olive oil, eggs, yogurt, and vanilla until well combined.
2/3 cup (133 g) brown sugar, 2/3 cup (133 g) granulated sugar*, 1/2 cup (120 ml) olive oil*, 3 large eggs, 1/3 cup (80 g) plain Greek yogurt or sour cream, 2 teaspoons vanilla
In this order, add the flour, cocoa powder, baking soda, espresso powder, and salt. Using a fork gently combine the dry ingredients (on top of the wet) before mixing them into the wet.
1 1/3 cups (173 g) all purpose flour, 2/3 cup (67 g) unsweetened cocoa powder, 1 teaspoon baking soda*, 1 teaspoon instant espresso powder, 1/2 teaspoon salt
Fold in the zucchini until combined.
1 1/2 cups (275 g) finely grated zucchini
Fold in the chocolate chips.
1 cup (6 ounces) semi-sweet chocolate chips, plus more for topping
Grease and line a 9 x 5 inch loaf pan with parchment paper. Transfer the batter into the prepared pan. Top with additional chocolate chips if desired.
Bake for 65-75 minutes or until a toothpick inserted into the center comes out mostly clean (there will be a few crumbs and melted chocolate on the toothpick). Allow the loaf to cool on a wire rack for 20-30 minutes. Remove the bread from the pan and cool completely on the wire rack before slicing.