Preheat oven to 350 degrees. In large mixing bowl, beat eggs until frothy. Add sugar, oil, zucchini, and vanilla.
In a small bowl, mix together, flour, baking soda, baking powder, salt, cinnamon. Add to egg mixture, mixing well. Stir in nuts and/or raisins if desired.
Pour into 2 (9x3x3) greased loaf pans. Bake for 1 hour until bread tests done.