Preheat the oven to 350 degrees and line a 12-cup muffin tin with liners.
Grate three cups of zucchini.
In a separate bowl combine the 3 cups of flour, 1 1/4 tsp of cinnamon, 1 tsp of baking soda, 1 tsp of salt, and 1/2 tsp of baking powder. Stir together and set to the side.
In your Kitchenaid mixer fitted with the paddle attachment, add the cup of vegetable oil, 2 cups of sugar, and three eggs. Mix.
Next, stir in the 1/4 cup of cocoa powder and 2 tsp of vanilla, followed by the 3 cups of grated zucchini.
Once the zucchini has been mixed in, pour in the dry ingredients and stir until combined. Then add in the cup of chocolate chips and again mix until combined.
Fill each muffin cup to the top.
Place the muffin tin on the middle rack of the oven and bake at 350 degrees for 35-45 minutes. The muffins are done when they have risen, the middle is set, and when a toothpick is inserted it comes back out clean.
Remove from the muffin tins and cool on a cooling rack. Once they are cool, sprinkle with powered sugar and enjoy!