Preheat oven to 350°F (175°C). Line a 12-cup muffin tin with paper liners or lightly grease the cups.
In a medium bowl, whisk together flour, baking soda, baking powder, salt, and cinnamon.
In a large bowl, whisk together eggs, brown sugar, granulated sugar, oil, and vanilla extract until smooth.
Stir in the shredded zucchini until evenly combined.
Gradually add the dry ingredients to the wet ingredients and mix just until combined.
Fold in the chocolate chips.
Divide the batter evenly among the muffin cups, filling each about ¾ full.
Sprinkle the tops with the extra chocolate chips.
Bake for 18–22 minutes, or until a toothpick inserted in the center comes out clean.
Cool in the pan for 5 minutes before transferring to a wire rack to cool completely.