Preheat oven to 325 degrees F.
Grease and flour 2 loaf pans or use baking spray with flour.
Combine beaten eggs, oil, sugar, zucchini and vanilla.
Into a large bowl, sift together the flour, baking soda, baking powder, cinnamon, and salt.
Blend dry ingredients into the batter. Add nuts if using.
Divide batter between 2 loaf pans and bake 50 - 60 minutes (I use the toothpick trick).