Preheat oven to 350°F.
Line an 8x8 baking pan line with parchment paper, creating a sling.
In a large mixing bowl, whisk together the sugar, oil, and vanilla.
Add the flour, cocoa, baking soda, and salt, and stir with a spatula. (The batter will be dry.)
Fold in the zucchini until thoroughly combined and the batter loosens. Stir in chocolate chips.
Press the batter into an even layer in the prepared baking pan.
Bake for 25 to 30 minutes or until a wooden pick inserted into the center comes out with a few moist crumbs. **Note the top of the brownies might crack while baking, but due to the thickness of the brownies, they will still be very moist.
Let the brownies cool completely in the pan. Remove and then frost.