Step 1: Preheat your oven to 325°F (160°C). Grease and flour a 9x5-inch loaf pan, or line it with parchment paper, leaving an overhang on the long sides for easy removal.
Step 2: In a large bowl, whisk together the eggs, granulated sugar, brown sugar, vegetable oil, and vanilla extract until well combined and smooth.
Step 3: Fold in the grated zucchini. Do not squeeze out the liquid unless the zucchini is excessively watery, as the moisture is crucial for a tender loaf.
Step 4: In a separate medium bowl, whisk together the all-purpose flour, baking soda, baking powder, salt, ground cinnamon, and ground nutmeg.
Step 5: Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Be careful not to overmix; a few lumps are fine. If using, gently fold in chocolate chips or nuts.
Step 6: Pour the batter into your prepared loaf pan and spread it evenly. Bake for 50-65 minutes, or until a wooden skewer or toothpick inserted into the center comes out clean. If the top browns too quickly, loosely tent with foil.
Step 7: Once baked, let the zucchini bread cool in the pan on a wire rack for 10-15 minutes. Then, carefully lift it out of the pan and let it cool completely on the wire rack before slicing and serving.