The best Zucchini Brownies recipe has easy-to-make fudgy brownies with fluffy peanut butter frosting, all covered in a chocolate glaze. These brownies may be made with gluten free adaptation or traditional.
Preheat the oven to 350ºF. Grease a 9X13" pan and set aside.
In a food processor place zucchini chunks, melted butter, eggs, and vanilla. Process until smooth. If you are making brownies without a food processor, see the RECIPE NOTES for using grated zucchini.
Add the sugar, cocoa powder, baking powder, salt, and flour. Process until just combined. Add chocolate chips and pulse a few times to break up the chips a bit.
Pour into the prepared 9X13" pan and bake for 30-35 minutes, or until toothpick inserted in middle comes out without wet batter. Cool completely in pan while making peanut butter frosting.
Peanut Butter Frosting:
In a medium mixing bowl, use a hand mixer to beat together on LOW SPEED the peanut butter, softened butter, powdered sugar, vanilla, and salt. Once all the ingredients are incorporated, scrape down bowl. Increase speed to HIGH and beat until smooth and fluffy, about 1 minute.
Add the milk and mix well. If frosting is too thick, add a splash more of milk until you reach desired consistency. Spread the frosting on the cooled brownies.
In a microwave safe bowl place chocolate chips and butter. Melt in microwave for 30-60 seconds, or until the chips and butter are melted. Stir until completely smooth and well combined.
Pour glaze over peanut butter frosting and spread with an offset spatula. Chill brownies for 15 minutes to set chocolate glaze before cutting into bars.
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best Tips and Tricks
If you don't have a food processor use a grater and measure out 3 cups of shredded zucchini instead. Mix with butter, eggs, and vanilla then add remaining ingredients.
This recipe can easily be halved and baked in a 8" or 9" square pan. Bake for 30 minutes.
The peanut butter frosting may be left off. Simply top with the chocolate glaze or for chocolate frosting combine 6 tablespoons cocoa powder, 4 tablespoons melted butter, 2 cups powdered sugar, and 1/4 cup milk in a medium bowl. Spread on slightly warm brownies.