Preheat your oven to 350°F (175°C) and line a muffin tin with paper liners.
In a mixing bowl, combine grated zucchini, sugar, and brown sugar.
Add vegetable oil, eggs, and vanilla extract to the zucchini mixture, and mix well.
In a separate bowl, whisk together flour, cocoa powder, baking soda, and salt.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Fold in the chocolate chips gently.
Fill each muffin cup about 2/3 full with the batter.
Bake in the preheated oven for 20-25 minutes or until a toothpick comes out clean.
Allow muffins to cool in the pan for 5 minutes, then transfer to a wire rack.
Enjoy your delicious chocolate zucchini muffins warm or at room temperature!