Pre-heat oven to 350° F. Prepare pan by lining with parchment paper or use baking spray.
Grate zucchini, then squeeze out liquid.
In a large bowl stir together apple sauce and vegetable oil. Then add the vanilla, sugar and egg.
Stir in baking soda, cinnamon, salt and flour until just combined.
Fold in grated zucchini and chocolate chips, reserving a few chocolate chips to sprinkle on top.
Spoon into a prepared loaf pan and bake for about 1 hour.
Remove from oven and allow to rest on a cooling rack for 5 to10 minutes before removing from the pan. Note: using parchment paper to line the pan makes removing the loaf much easier.
Let cool completely before slicing.
Cover with plastic wrap or store in a large resealable plastic bag. Can be stored in the refrigerator for about a week or in the freezer for several months.