Preheat your oven to 350°F (175°C) and line a muffin tin with paper liners.
In a large bowl, mix together the grated zucchini and sugars.
Add the vegetable oil, eggs, and vanilla extract to the zucchini mixture, stirring until well combined.
In another bowl, whisk together the flour, baking powder, baking soda, salt, and cinnamon.
Gradually incorporate the dry ingredients into the wet mixture, stirring just until moistened.
If desired, fold in nuts or chocolate chips.
Divide the batter evenly among the muffin cups, filling each about 2/3 full.
Bake in the preheated oven for 20-25 minutes, or until a toothpick inserted comes out clean.
Remove from the oven and let cool in the pan for 5 minutes.
Transfer the muffins to a wire rack to cool completely.