Preheat oven to 350 degrees.
Shred zucchini and combine in a large mixing bowl with brown sugar, vegetable oil, eggs, and vanilla.
In a separate bowl, stir dry ingredients, including flour, oats, baking powder, baking soda, salt, and cinnamon. Mix well.
Pour wet ingredients in with the dry ingredients and mix until just combined. (Don't overmix.)
Add chocolate chips.
Spray two muffin pans with cooking spray, or line the pan with muffin liners.
Using the largest Home & Kind food scoop, fill each pan with muffin batter.
Add additional chocolate chips on top, if desired.
Bake at 350 degrees for 15-20 minutes.