To a medium bowl, add the flour, cocoa, baking soda, and Kosher salt. Whisk together until thoroughly combined then add to the oil/sugar mixture. Beat on low speed until completely combined and a fine dry crumb is formed. Mixture will be very dry at this stage.
11 ounces all purpose flour, 2 ounces unsweetened baking cocoa, 1 1/2 teaspoons baking soda, 1 teaspoon Kosher salt
Using a rubber spatula, fold in the shredded zucchini until completely combined and mixture is moistened. Allow to rest for 5-10 minutes. During the rest, the zucchini will release its liquid and the mixture will now look like batter.
16 ounces shredded zucchini
Stir the 1 cup of chopped chocolate into the batter and scrape the batter into the prepared pan. Spread out to an even layer.
5.5 ounces chopped baking chocolate
If using, sprinkle the 1/2 cup chopped chocolate over the top of the batter.
2.5 ounces chopped baking chocolate
Bake for 25-35 minutes, or until a toothpick comes out fairly clean. Crumbs may still stick to the toothpick but it should not be wet.
Remove pan from oven and place on wire rack. Allow to cool completely, then use parchment paper handles to remove brownies from the pan.
If you weigh your ingredients, your results should be the same as mine. Please keep in mind that some zucchini have more moisture than others, so results can vary a bit. That’s why I chose to weigh everything to give you the best chance of successful results. Also note that the 16 ounces of zucchini was weighed after the ends were trimmed off and it was shredded, therefore buying a pound of zucchini at the store will result in slightly less than you need.
A note on chocolate chips vs chopped chocolate. I love a really chocolatey brownie. If you do as well, use the chopped chocolate or jumbo chocolate chips. If you don’t then mini chocolate chips are actually perfect for this recipe.
When lining the pan with parchment, you can spray the bottom of the pan first to help the parchment stay in place. Alternatively, you can use chip clips to hold the parchment in place until the batter has been added. Just be sure to remove the clips before putting the pan in the oven!