Grease two 8 x 4-inch loaf pans. Line the bottoms with parchment and grease the top of the parchment. Preheat oven to 325º.
Sift flour, salt, baking powder, soda, and cinnamon into a medium bowl and set aside.
Beat eggs, oil, vanilla, and sugars together in a large bowl. Mix in the salt, baking powder, soda, and cinnamon mixture.
Then mix in zucchini with a wooden spoon or spatula till just incorporated. Stir in zucchini. Pour batter into baking pans.
Bake for 50 to 60+ minutes, or until a toothpick inserted in the center comes out clean. Cool the in pans on a rack for 10 minutes. Remove bread from the pan, and completely cool.