Preheat the oven to 350°F (175°C). Grease a 9×5-inch loaf pan and set aside.
In a medium bowl, whisk together the flour, baking soda, baking powder, salt, cinnamon, nutmeg, cloves, and ginger until well combined.
In a large bowl, whisk the granulated sugar, brown sugar, and vegetable oil until combined.
Add the eggs one at a time to the sugar and oil mixture, beating well after each addition.
Stir in the vanilla extract.
Fold the dry ingredients into the wet ingredients until just combined.
Gently fold in the grated zucchini and chopped walnuts, if using, until evenly distributed.
Pour the batter into the prepared loaf pan and smooth the top with a spatula.
Bake for 50 to 60 minutes, or until a toothpick inserted into the center comes out clean.
Remove the bread from the oven and let it cool in the pan for 10 minutes.
Transfer the bread to a wire rack and allow it to cool completely before slicing.