Spray 2 - 9"x5" loaf pans with nonstick cooking spray that contains flour (see notes). Preheat oven to 350°F.
In a medium size bowl combine flour, salt, baking soda, baking powder, cinnamon. Whisk to combine. Set aside.
In a large bowl whisk the eggs, sugar, zucchini, oil, and vanilla until well blended.
Add the dry ingredients to the wet ingredients. Using a large spoon or spatula, mix until combined.
In a small bowl add the chocolate chips and 1 T. flour. Toss until flour is coating the chocolate chips.
Add the chocolate chips to the zucchini bread batter. Fold to combine.
Place batter in the two loaf pans. Top with additional chocolate chips if desired. Bake for 45-55 minutes, or until a toothpick inserted in the center comes out clean or with a few moist crumbs on it.
Remove from the oven. Let cool in pan for 10 minutes then remove from the bread pans and let sit on a cooling rack to cool completely.