Follow these simple steps to create your delectable Chocolate Zucchini Muffins:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Line a muffin tin with paper liners or spray it with cooking spray.

2. Prepare Zucchini: Grate the zucchini using a box grater or a food processor. If desired, lightly squeeze the grated zucchini to remove excess moisture, but don’t squeeze too much.

3. Mix Dry Ingredients: In a large bowl, combine the flour, cocoa powder, granulated sugar, brown sugar, baking powder, baking soda, and salt. Whisk thoroughly to ensure even distribution of the ingredients.

4. Mix Wet Ingredients: In a separate bowl, whisk together the vegetable oil, eggs, and vanilla extract until well combined.

5. Combine Mixtures: Add the wet ingredients to the dry mixture and stir gently until just combined. Be careful not to overmix; some lumps are okay.

6. Fold in Zucchini: Gently fold the grated zucchini into the batter. If using, add the semi-sweet chocolate chips at this stage.

7. Fill Muffin Tin: Spoon the batter into the prepared muffin tin, filling each cup about 2/3 full to allow for rising.

8. Bake: Place the muffin tin in the preheated oven and bake for 20-25 minutes. Check for doneness by inserting a toothpick into the center; it should come out clean or with a few moist crumbs.

9. Cool: Once baked, remove the muffins from the oven and let them cool in the tin for about 10 minutes before transferring them to a wire rack to cool completely.