Grate the zucchini on the large holes of a box grater. Use a strainer or dishtowel to then squeeze some of the moisture out of the zucchini. Set aside.
In a large mixing bowl, combine flour, baking powder, salt, cinnamon and sugar.
In another large bowl, whisk together the milk, eggs, and vanilla extract. Add the flour mixture and beat until smooth. Fold in the zucchini and mix well.