Preheat oven to 350 degrees and spray two loaf pans generously with nonstick cooking spray.
Using a vegetable grater, shred your zucchini in a large bowl.
In another bowl, mix together sugar, sugar substitute, white flour, wheat flour, cocoa powder, baking soda, baking powder, salt, and cinnamon until well combined.
Add in eggs, vanilla, unsweetened applesauce, and vanilla extract. Blend using a blender until well combined, careful not to overmix. Fold in the zucchini and chocolate chips.
Pour the batter into prepared loaf pans, splitting evenly between the two pans. Bake for 50-60 minutes or until a toothpick inserted in the center comes out clean and the tops are springy. Remove loaf pans from oven, carefully dump bread out and onto a cooling rack and cool completely before slicing.