01 - Preheat the oven to 350°F. Grease and flour a 9x5-inch loaf pan.
02 - In a medium bowl, whisk together flour, baking soda, baking powder, salt, cinnamon, and nutmeg until evenly distributed.
03 - In a large bowl, beat the eggs, vegetable oil, granulated sugar, brown sugar, and vanilla until well combined and smooth.
04 - Stir the grated zucchini into the wet mixture until evenly distributed throughout.
05 - Add the dry ingredients to the wet ingredients and fold gently until just incorporated. Do not overmix to maintain tender texture.
06 - Fold in chopped nuts if using, distributing evenly throughout the batter.
07 - Pour batter into the prepared loaf pan and smooth the top with a spatula for even baking.
08 - Bake for 50–60 minutes, or until a toothpick inserted into the center comes out clean.
09 - Let cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before slicing.