Preheat your oven to 350°F (175°C). This allows the bread to bake evenly and rise beautifully.
Grate the zucchini using a box grater or food processor. Once grated, place it in a clean kitchen towel and squeeze out excess moisture to prevent sogginess.
In a large mixing bowl, whisk together the eggs, white sugar, brown sugar, oil, and vanilla extract until well combined and slightly frothy.
In a separate bowl, whisk together the flour, baking soda, baking powder, salt, cinnamon, and nutmeg to evenly distribute the leavening agents and spices.
Gradually add the dry ingredients to the wet mixture, stirring gently until just combined. Avoid overmixing to keep the bread tender.
Gently fold in the grated zucchini, chocolate chips, and chopped walnuts using a rubber spatula. Reserve some chocolate chips and walnuts for topping if desired.
Pour the batter into a greased 9x5-inch loaf pan, smoothing the top. Sprinkle the reserved chocolate chips and walnuts on top. Bake for 50-60 minutes, or until a toothpick inserted into the center comes out clean.
Remove the loaf from the oven and let it cool in the pan for about 10 minutes. Transfer to a wire rack to cool completely before slicing.