Preheat oven to 350°F (175°C).
Prepare two loaf pans by lining the bottoms with parchment paper and lightly greasing the sides.
In a large bowl, cream together the sugars, applesauce, oil, and eggs until smooth.
In a separate bowl, whisk together the flour, salt, baking soda, baking powder, and cinnamon.
Add the dry mixture to the wet mixture and stir until just combined—don’t overmix.
Fold in grated zucchini and vanilla until evenly distributed.
Gently stir in chocolate chips.
Divide the batter evenly between the two prepared pans.
Bake for 55–60 minutes, or until a toothpick inserted in the center comes out clean.