Preheat your oven to 350°F (175°C).
In a large mixing bowl, combine the grated zucchini, sugar, vegetable oil, and vanilla extract.
In another bowl, whisk together the flour, baking soda, baking powder, salt, and cinnamon.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Pour the batter into a greased baking pan.
Bake for 45 minutes or until a toothpick inserted into the center comes out clean.
Let the cake cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.