Grease and flour two 8x4 inch loaf pans. Preheat oven to 325 degrees Fahrenheit.
In a medium mixing bowl, combine flour, salt, baking soda, baking powder, and cinnamon. Whisk to combine.
In a large mixing bowl, or bowl of your stand mixer, combine sugar, eggs, melted butter, and vanilla extract. Mix on medium speed until fully incorporated.
Gradually add dry ingredients to wet ingredients, mixing until just combined.
Next, add in zucchini. Mix until combined.