Preheat your oven to 350°F (175°C) and grease or line a 9x5 inch loaf pan.

In a large mixing bowl, combine the chocolate cake mix, eggs, vegetable oil, milk, and vanilla extract. Mix until smooth.

Grate zucchini and squeeze out excess moisture. Stir into the batter until evenly distributed.

Fold in chocolate chips, ground cinnamon, and salt until just combined.

Pour the batter into the prepared loaf pan and smooth the top.

Bake for 45-55 minutes or until a toothpick comes out clean with a few moist crumbs.

Let the bread cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.

Slice into pieces and serve.