Lemon Zucchini Bread

Preheat oven to 375 degrees F. Coat a 9-by-5-inch loaf pan with cooking spray.

Whisk whole-wheat flour, all-purpose flour, lemon zest, cinnamon, salt, baking soda and baking powder in a large bowl. Whisk sugar, oil, eggs and vanilla in a medium bowl. Stir in the zucchini. Add the zucchini mixture to the dry ingredients. Stir until just incorporated. Transfer to the prepared pan.

Bake until a toothpick inserted in the center of the loaf comes out clean, about 50 minutes. Cool in the pan for 5 minutes, then turn out onto a cooling rack to cool completely.