Preheat the oven to 350°F (175°C). Grease your loaf pan or line it with parchment paper for easy removal.
Grate the zucchini using the large holes of your grater. Lightly squeeze out excess moisture, but don’t dry it completely — that’s what keeps the bread moist.
Mix the wet ingredients: In a large bowl, whisk together sugar, oil, eggs, and vanilla until smooth.
Add dry ingredients: Sprinkle in flour, baking soda, baking powder, salt, cinnamon, and nutmeg. Stir gently until just combined — don’t overmix.
Fold in zucchini and any optional mix-ins like nuts or chocolate chips.
Pour into the loaf pan and smooth the top. Bake for 55–60 minutes, or until a toothpick inserted in the center comes out clean.
Cool completely on a wire rack before slicing. The flavor deepens as it cools, so be patient — it’s worth the wait!