Preheat the oven to 350°F (175°C) and grease a loaf pan.

In a mixing bowl, combine the dry ingredients: whole wheat flour, baking soda, baking powder, salt, and cinnamon.

In another bowl, mix the wet ingredients: grated zucchini, honey or maple syrup, applesauce, eggs, and vanilla extract.

Pour the wet ingredients into the dry ingredients and stir until just combined.

Pour the batter into the prepared loaf pan and smooth the top.

Bake in the preheated oven for 45-50 minutes, or until a toothpick inserted in the center comes out clean.

Allow the bread to cool in the pan for 10 minutes before transferring to a wire rack to cool completely.