01 -
Heat your oven to 350°F and prepare a 9x13-inch baking dish by coating it with flour-infused baking spray. Line the bottom and sides with parchment paper, leaving some overhang for easy removal later.
02 -
In a spacious mixing bowl, blend the sugar, oil, and vanilla until well combined. Add the flour, cocoa powder, baking soda, and salt, stirring with a spatula until you have a somewhat dry mixture. Gently fold in the shredded zucchini until the batter becomes more cohesive, then mix in the chocolate chips. Transfer this mixture to your prepared baking dish, spreading it evenly.
03 -
Place in the preheated oven and bake for 20-25 minutes, or until a toothpick inserted in the center emerges with just a few moist crumbs clinging to it. Allow the brownies to cool completely in the pan before proceeding.
04 -
In a medium-sized bowl, sift together the powdered sugar and cocoa powder. Gradually whisk in the warm milk and melted butter until you achieve a smooth, spreadable consistency.
05 -
Once the brownies are completely cool, lift them from the pan using the parchment overhang. Spread the chocolate frosting evenly across the top, then let it set for 10-15 minutes before cutting into squares and serving.