Preheat oven to 350 degrees F and spray 9 x 5 non-stick loaf pan with cooking spray. Set aside.
In a large mixing bowl, add eggs, lemon zest, lemon juice, maple syrup, oil and vanilla extract. Whisk well. Then add baking powder, baking soda, and salt. Whisk until no lumps are visible. Mixture will be foamy.
Add flour and gently mix, batter will be thick. Then add zucchini and stir until incorporated.
Transfer batter into previously prepared loaf pan and level with spatula. Bake for 60-70 minutes or until the toothpick inserted in the middle comes out clean.
Remove bread from the oven and transfer to a cooling rack to cool off for 10 minutes. Then remove bread from a loaf pan and let it cool completely, so the glaze can stick to it.
In a small bowl, whisk icing sugar with lemon juice until lemon glaze forms. Drizzle it on top of cool bread and sprinkle with lemon zest. Let glaze set for about 1 hour and then slice with sharp serrated knife.
Notes
Store: Store bread covered in a cool dry place for up to 3 days. After refrigerate for another 2 days.
Freeze: In an airtight container for up to 3 months.
Feel free to add 1/2 cup blueberries or 1 tablespoon of poppy seeds to the batter.