In a large bowl, stir zucchini, beaten eggs, vanilla extract, olive oil, applesauce, brown sugar, and maple syrup until well combined
In a separate bowl, combine flour, baking soda, baking powder, salt, cinnamon, and 1/3 cup oats and whisk until combined
Make a well in the center of the bowl containing the dry ingredients
Pour wet ingredients into the center of the well and mix by hand until just combined (do not over mix)
Fill muffin liners 3/4 of the way full with batter (it should make 24 muffins)
Sprinkle tops with additional oats and a sprinkle of brown sugar
Bake at 350 degrees for 17-20 minutes, or until a toothpick inserted into the middle comes out clean
Cool on a baking rack and store in a ziploc bag for 3-5 days or in the freezer for up to a month