Preheat oven to 350°F (175°C). Line a muffin tin with paper liners or lightly grease.
Prep the zucchini: Grate and squeeze out as much moisture as possible using a clean kitchen towel or cheesecloth.
Mix the dry ingredients: In a large bowl, combine flour, baking soda, baking powder, salt, and cinnamon.
Whisk the wet ingredients: In a separate bowl, beat the eggs with oil, sugars, and vanilla.
Combine: Add the wet mixture to the dry ingredients, stirring until just combined.
Fold in zucchini and chocolate chips: Be careful not to overmix.
Fill muffin cups about ¾ full.
Bake for 18–22 minutes, or until a toothpick comes out clean.
Cool for 5 minutes in the pan, then transfer to a wire rack.