Preheat the oven to 350 degrees.
Grease two 8x5" or 13x4" loaf pans.
Grate/shredded the zucchini. Set aside.
In a large bowl, whisk together the sugar, oil, and applesauce.
Add the vanilla and eggs, whisking well to combine
Add the cinnamon, baking powder, baking soda, and salt. Whisk well to combine.
Add the all-purpose and whole wheat flours and stir until combined.
Fold in the shredded zucchini and chocolate chips.
Divide the batter between the two loaf pans.
For 8x5", bake for 45-55 minutes, or until toothpick comes out clean. For 13x4" pan, bake 40-45 minutes, or until toothpick comes out clean. If you notice the top is getting brown towards the end, cover with foil for the last 5-10 minutes.
Cool for about 10 minutes and then remove from loaf pan and cool completely.