01 - Preheat the oven to 350°F. Line a 12-cup muffin tin with paper liners or lightly grease with cooking spray.
02 - In a medium bowl, whisk together the flour, baking powder, baking soda, salt, cinnamon, and nutmeg until well blended.
03 - In a large bowl, beat the eggs with vegetable oil, sugar, Greek yogurt, vanilla, and lemon zest until smooth and fully incorporated.
04 - Fold the grated zucchini into the wet mixture until evenly distributed throughout the batter.
05 - Add the dry ingredients to the wet mixture and stir gently until just combined. Do not overmix to ensure tender muffins.
06 - Divide the batter evenly among the 12 muffin cups, filling each about three-quarters full.
07 - Bake for 22–25 minutes, or until a toothpick inserted in the center comes out clean and the tops are golden brown.
08 - Let the muffins cool in the pan for 5 minutes, then transfer to a wire rack to cool completely before glazing.
09 - Whisk together powdered sugar, lemon juice, and zest until smooth and pourable. Adjust consistency with additional juice if needed.
10 - Drizzle the glaze over cooled muffins and let set for 10–15 minutes before serving.