Preheat the oven to 350°F and spray a 9 x 13 inch pan with nonstick cooking spray or line with parchment paper. Set aside.
In the bowl of a stand mizer fitted with a paddle attachment or a large mixing bowl using an electric hand mixer, whisk together the oil, sugars, vanilla extract, and egg until combined.
Sift or whisk together the flour, cocoa powder, salt. Slowly add to wet mixture, then stir in chocolate chips and zucchini by hand. Do not over mix.
Spread evenly into the prepared baking pan.
Bake for 20-25 minutes, or until it passes the toothpick test. Remove and allow to cool fully before slicing.
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