Step 1

Preheat oven to 350°F and line a loaf pan with parchment paper and cooking spray.

Step 2

In a large bowl, fold together zucchini, sugar, olive oil, Greek yogurt, eggs, lemon zest, and vanilla extract.

Step 3

In a medium bowl, whisk flour, cinnamon, baking powder, salt, and baking soda. Fold dry ingredients into wet and mix until incorporated. Fold in walnuts (if using).

Step 4

Pour batter into prepared pan and bake until golden brown and a toothpick inserted into the center comes out clean, rotating the pan halfway through, 45-50 minutes. Let cool in pan for 10 minutes, then remove and slice.

Step 5

Meanwhile, make the glaze. Whisk all ingredients until smooth. Drizzle glaze over cooled bread and serve immediately.