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, granulated sugar, brown sugar, vegetable oil, eggs, and vanilla extract until well combined.

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

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