Preheat the oven to 350℉. Line a 9x5-inch loaf pan with parchment paper, or spray with cooking spray or baking spray. Set aside.
In a medium mixing bowl, add the flour, sugar, baking powder, baking soda, cinnamon, and salt. Stir together with a whisk until combined. Set aside.
2 cups all-purpose flour, 1 cup granulated sugar, 1 teaspoon baking powder, ½ teaspoon baking soda, ½ teaspoon ground cinnamon, ½ teaspoon salt
In a separate larger mixing bowl, add the grated zucchini, eggs, oil, water, lemon juice and lemon zest. Stir with a whisk or spatula until combined.
2 cups grated zucchini, 2 large eggs, 1/2 cup vegetable or canola oil, 1/4 cup water, 2 tablespoons freshly squeezed lemon juice, lemon zest
Dump half the dry ingredients into the bowl of wet ingredients and stir together just until combined. Add the remaining dry ingredients and stir together just until combined and no flour streaks or pockets remain.
Dump the batter into the prepared loaf pan and bake for 50 minutes or until a toothpick inserted into the middle comes out clean with no wet batter on it. * If the bread is getting too browned, loosely lay a piece of foil over top it for the last 15 minutes or so of the bake time. Once baked, remove the loaf pan from the oven and let it cool completely at room temperature. Once cooled, remove the bread loaf from the pan and set it on a plate or cooling rack for glazing.
Make The Lemon Glaze : Stir together the powdered sugar and fresh lemon juice until smooth and combined. Use a fork to drizzle it over the cooled loaf of lemon zucchini bread.
2 cups powdered sugar, 3 tablespoons freshly squeezed lemon juice