Preheat your oven to 350°F (175°C) and grease a 9x5-inch loaf pan.
Squeeze out excess moisture from the grated zucchini and set aside.
In a bowl, whisk together the gluten-free flour, cocoa powder, baking soda, baking powder, and salt.
In a large bowl, combine the grated zucchini, vegetable oil, granulated sugar, brown sugar, eggs, and vanilla extract. Mix until smooth.
Gradually add the dry ingredients to the wet mixture and stir gently until just combined.
Fold in the semi-sweet chocolate chips until evenly distributed.
Pour the batter into the prepared loaf pan and smooth the top.
Bake for 50-60 minutes, checking for doneness with a toothpick.
Let the bread cool in the pan for about 10 minutes before transferring to a wire rack.