Preheat your oven to 350°F (175°C). Grease two 9×5-inch loaf pans or line them with parchment paper.

Grate the zucchini and place it in a bowl.

In a large bowl, whisk together the flour, baking soda, baking powder, salt, cinnamon, and nutmeg.

In another bowl, mix the granulated sugar, brown sugar, vegetable oil, eggs, and vanilla extract until smooth.

Gradually add the dry ingredients to the wet mix, stirring gently until just combined.

Fold in the grated zucchini and nuts (if using).

Pour the batter evenly into the prepared loaf pans.

Bake in the oven for 50-60 minutes. Check for doneness by inserting a toothpick into the center; it should come out clean.

Once baked, let the loaves cool in the pans for about 10 minutes before transferring them to a wire rack to cool completely.