Preheat oven to 350°F and spray two loaf pans with olive oil. Mix sugar, applesauce, eggs and vanilla in a large mixing bowl, beating until well-combined. Stir together flour, cocoa powder, salt, baking soda, cinnamon and baking powder. Gradually beat into sugar mixture until just combined. Batter will be very thick. Add zucchini to batter and stir to combine. Spoon batter evenly into the prepared loaf pans and sprinkle each with chocolate chips. Bake 50-60 minutes or until a knife inserted in the center comes out clean. Cool 10 minutes on a rack, in the loaf pan. Remove from pans and cool completely on a cake rack.