Preheat oven to 325°. Spray two 9” x 5” bread pans with nonstick spray.
In a large mixing bowl, combine zucchini, oil, eggs, and vanilla. Mix thoroughly. Beat sugar into mix until it is thoroughly creamed. Once liquids and sugar are well mixed, add flour, baking soda, baking powder, salt, and cinnamon. Mix until batter is well blended and even in texture. The batter should be smooth, except for the zucchini shreds. If it’s not, add a little juice from the zucchini.
Pour batter evenly into pans. Bake for approximately one hour, or until bread is brown and springs back when gently pressed in the middle.