Preheat the Oven: Preheat your oven to 350°F (175°C). Grease a 9x5-inch loaf pan or line it with parchment paper to prevent sticking.
Prepare the Zucchini: Grate the zucchini using a box grater or food processor. You’ll need about 1 ½ cups of grated zucchini.Place the grated zucchini in a clean kitchen towel and squeeze out any excess moisture. Mix Wet Ingredients: In a large mixing bowl, whisk together the eggs, vegetable oil (or melted butter), granulated sugar, brown sugar, and vanilla extract until smooth and combined.
Sift Dry Ingredients: In a separate bowl, sift together the flour, baking powder, baking soda, salt, cinnamon, and nutmeg.
Combine Wet and Dry Ingredients: Gradually add the dry ingredients to the wet ingredients, stirring gently until just combined. Do not overmix the batter.
Fold in Zucchini: Fold the grated zucchini into the batter, ensuring it is evenly distributed. If using, fold in walnuts or chocolate chips.
Bake the Bread: Pour the batter into the prepared loaf pan and smooth the top. Bake for 60-70 minutes, or until a toothpick inserted into the center comes out clean or with just a few moist crumbs. Cool and Slice: Let the zucchini bread cool in the pan for 10 minutes before transferring it to a wire rack to cool completely. Once cooled, slice and serve.