Preheat oven to 350 degrees. Grease a 9 x 5 inch loaf pan with butter or oil.
Grate the zucchini. Using paper towels or a clean tea towel, squeeze as much moisture out as you humanly can with your almightly hand muscles. Your zucchini shreds, after draining, will need to yield 1 1/2 cups worth.
In a bowl, whisk the vegetable oil and brown sugar until combined. Whip in the eggs, one at a time, then the vanilla and the zucchini. Add the flour, cinnamon, baking powder, baking soda, and salt. Fold in the chocolate chips until incorporated. Do not overmix.
Pour the batter into the prepared loaf pan. Sprinkle a few extra chocolate chips on top, if desired.
Bake 55-65 minutes until the center is set and an inserted toothpick or skewer emerges with just a few moist crumbs. Start checking the loaf after 45 minutes for doneness.
Cool the loaf in the pan for 10 minute. Run a knife around the edges to loosen, then invert the loaf onto a wire rack. Flip upright. Cool at least 30 minutes before slicing and serving!