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

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

In another bowl, mix the wet ingredients: grated zucchini, vegetable oil, sugar, eggs, and vanilla extract until well combined.

Gradually add the dry ingredients to the wet ingredients, stirring until just combined. Fold in any optional add-ins if desired.

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 into 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.