01 - Preheat oven to 350°F. Line a 12-cup muffin tin with paper liners or lightly grease with nonstick spray.
02 - In a large mixing bowl, whisk together flour, baking powder, baking soda, salt, cinnamon, and nutmeg.
03 - In a separate medium bowl, beat eggs. Add oil, granulated sugar, brown sugar, and vanilla extract; whisk until smooth and well combined.
04 - Fold the wet mixture into the dry ingredients until just combined. Do not overmix to maintain tender texture.
05 - Gently fold in grated zucchini and any optional add-ins such as nuts, chocolate chips, or raisins.
06 - Divide batter evenly among prepared muffin cups, filling each approximately three-quarters full.
07 - Bake for 22 to 25 minutes, or until a toothpick inserted in the center comes out clean.
08 - Allow muffins to cool in pan for 5 minutes, then transfer to a wire rack to cool completely.