Preheat your oven to 350°F. Line a 1-pound loaf pan (8.5 x 4.5 inches) with parchment paper and set aside.
In a medium bowl, whisk together all-purpose flour, baking powder, baking soda, ground cinnamon, ground nutmeg, and salt.
1 & 1/2 cup all-purpose flour, 1/2 teaspoon baking powder, 3/4 teaspoon baking soda, 1 teaspoon ground cinnamon, 1/4 teaspoon ground nutmeg, 1/2 teaspoon salt
In a large bowl, whisk together the oil, granulated white sugar, brown sugar, an egg, an egg yolk, and vanilla extract, until completely smooth
1/2 cup vegetable oil, 1/3 cup brown sugar, 3/4 cup granulated sugar, 1 large egg, 1 egg yolk, 1 tablespoonj vanilla extract
Stir in the grated zucchini until evenly distributed.
1 & 1/3 cup grated zucchini with skin on
Add the dry ingredients to the wet ingredients, mixing just until combined. Do not over-mix. Fold in the chopped walnuts or pecans if using.
1/2 cup chopped walnuts or pecans or chocolate chips
Pour the batter into the prepared loaf pan and smooth the top with a spatula. Bake for 50-60 minutes, or until a toothpick inserted into the center comes out clean. If the top starts to brown too quickly, cover it loosely with aluminum foil during the last 10-15 minutes of baking.
Remove the bread from the oven and let it cool in the pan for 10 minutes. Transfer the bread to a wire rack to cool completely before slicing. Enjoy!