Preheat your oven to 350ºF. Prep an 8x8 baking dish with parchment paper, cooking spray, or butter for an easy, non-stick removal.
In a medium bowl mix flour, cocoa powder, baking soda, and salt. Set aside.
In a medium-large bowl, mix sugar, oil, and vanilla extract until a thick paste forms.
Add dry ingredients to your wet ingredients and mix until well combined. Your batter may be slightly dry.
Add zucchini and stir. Your batter will thicken and be much more wet.
Pour into your prepared baking dish and bake for at least 20 minutes. After 20 minutes, monitor the brownies and remove from oven when a toothpick or skewer inserted in the center comes out slightly wet. If it comes out dry, you've over baked it. The brownies will continue to cook after removed from the oven, so don't worry about the slightly wet middle. Make sure it doesn't completely coat the toothpick, but the toothpick shouldn't be dry, either.
Let cool for at least 5 minutes before removing from dish to cool on a wire cooling rack. Slice into 16 portions and enjoy!