01 - Preheat oven to 350°F. Line a 12-cup muffin tin with paper liners or grease lightly.
02 - Whisk together flour, baking powder, baking soda, salt, cinnamon, and nutmeg in a medium bowl.
03 - Beat eggs with vegetable oil, sugar, Greek yogurt, vanilla, and lemon zest in a large bowl until well combined.
04 - Fold grated zucchini into the wet mixture until evenly distributed.
05 - Add dry ingredients to wet mixture and stir gently until just combined. Avoid overmixing.
06 - Divide batter evenly among the prepared muffin cups.
07 - Bake for 22-25 minutes until a toothpick inserted in the center comes out clean.
08 - Let muffins cool in pan for 5 minutes, then transfer to a wire rack to cool completely.
09 - Whisk together powdered sugar, lemon juice, and zest until smooth and pourable. Drizzle over cooled muffins and let set before serving.