Last Updated: November 10, 2026
Zucchini brownies are fudgy, deeply chocolatey squares with a moist center and a crackly top. The shredded zucchini disappears into the batter and adds moisture without any vegetable taste. This recipe makes a 9×9-inch pan of 16 brownies using one saucepan and a spatula, no mixer needed.
Fudgy or Cakey: Which Is This?
This version is fudgy. It uses melted butter, more chocolate than flour, and a short mixing time. Zucchini contributes water, which can push brownies toward cake if you add too much flour. A modest amount of flour and a well-squeezed zucchini keep the texture dense and chewy.
Ingredients
- 1/2 cup (1 stick) unsalted butter
- 4 ounces semisweet or bittersweet chocolate, chopped
- 1 cup granulated sugar
- 1/4 cup packed brown sugar
- 2 large eggs, plus 1 egg yolk
- 2 teaspoons vanilla extract
- 3/4 cup all-purpose flour
- 1/3 cup unsweetened cocoa powder
- 1/2 teaspoon baking powder
- 1/2 teaspoon salt
- 1 cup finely shredded zucchini, squeezed well
- 1/2 cup semisweet chocolate chips
Instructions
- Heat the oven to 350°F. Line a 9×9-inch pan with parchment, leaving an overhang on two sides, and lightly grease.
- Shred the zucchini on the small holes of a grater. Wrap in a kitchen towel and squeeze firmly until very little liquid comes out. You should end up with about 3/4 cup of squeezed zucchini.
- Melt the butter and chopped chocolate together in a medium saucepan over low heat, stirring until smooth. Remove from heat and cool for 5 minutes.
- Whisk in both sugars until combined.
- Whisk in the eggs, yolk, and vanilla one at a time. Stir vigorously for 1 minute until the batter looks glossy.
- Sift the flour, cocoa, baking powder, and salt over the batter. Fold until nearly combined.
- Fold in the zucchini and 1/4 cup of the chocolate chips.
- Spread the batter in the pan. Scatter the remaining chips on top.
- Bake 28 to 33 minutes, until the edges look set and a toothpick in the center comes out with moist crumbs, not wet batter.
- Cool completely in the pan on a rack, at least 1 hour. For clean cuts, chill 30 minutes, lift out with the parchment, and cut with a sharp knife wiped between slices.
Tips
- Squeeze thoroughly. Brownie batter is thicker than bread batter, so extra water has nowhere to go and can make the brownies gummy.
- Vigorous whisking gives a shiny top. Beating the sugar and eggs into warm chocolate helps form the thin, crackly crust.
- Do not overbake. Pull the pan when a skewer still has a few moist crumbs. The brownies set further as they cool.
- Use real chocolate. Chopped bars melt more smoothly than chips, which contain stabilizers designed to hold their shape.
- Cut cold. Warm brownies smear on the knife.
Variations
Mint Zucchini Brownies
Add 1/2 teaspoon peppermint extract with the vanilla and top the cooled brownies with melted chocolate.
Walnut or Pecan
Fold in 1/2 cup toasted chopped nuts with the zucchini.
Peanut Butter Swirl
Drop 1/4 cup warmed peanut butter in spoonfuls over the batter and drag a knife through for a marbled pattern.
Cream Cheese Swirl
Beat 4 ounces cream cheese with 1/4 cup sugar and 1 egg yolk, then swirl it into the top before baking.
Espresso Boost
Stir 1 teaspoon instant espresso powder into the melted chocolate to deepen the chocolate flavor.
Ingredient Notes
Chocolate and Cocoa
Using both melted chocolate and cocoa powder builds a deeper chocolate flavor than either alone. Natural or Dutch-process cocoa both work here since baking powder is the only leavener. Dutch-process gives a darker color and smoother flavor.
Zucchini
One small to medium zucchini is enough. Shred it on the fine side of a grater and squeeze hard. Because brownies rely on a dense batter, even a little extra water softens the texture.
Egg Yolk
The extra yolk adds richness and chew. If you prefer, use three whole eggs, but the brownies will be slightly more cakelike.
Salt
A half teaspoon sharpens the chocolate. A sprinkle of flaky salt on top before baking adds contrast.
Troubleshooting
- Greasy surface: The melted butter separated. Let the chocolate mixture cool slightly before adding the eggs.
- Raw center after the time is up: The pan may be glass or dark metal, which changes baking time. Bake in 3-minute increments.
- Dull top without a crackle: Whisk the eggs and sugar into the warm chocolate harder, for a full minute.
- Dry edges: The pan was overbaked or too large. Use a true 9×9-inch pan.
Serving Ideas
Serve warm with vanilla ice cream, dust with powdered sugar, or top with a thin chocolate ganache made from equal parts warm cream and chopped chocolate. Cold brownies with a glass of milk are also a classic.
Cutting Clean Squares
Brownies cut best when fully cooled and chilled briefly. Lift the slab out by the parchment, set it on a cutting board, and use a long, thin knife. Press straight down rather than sawing, wipe the blade clean between cuts, and trim the edges first if you want tidy squares. For 16 squares, make three cuts each way. For bar-style brownies, cut into 12 rectangles.
If you prefer a chewier edge, bake in a metal pan. Glass pans heat more slowly but hold heat longer, which can overbake the outside while the center catches up, so reduce the oven to 325°F if using glass.
Storage
Store brownies in an airtight container at room temperature for 3 days. Because of the zucchini, they are best refrigerated after that for up to 1 week. Bring to room temperature before serving, or warm for 10 seconds in a microwave for a softer center. To freeze, wrap individual squares tightly and freeze for up to 3 months.
Gifting and Serving
Cut the brownies into small squares and layer them in a tin with parchment between layers for gifts. They also travel well to potlucks since they hold their shape at room temperature.
FAQ
Can you taste the zucchini?
No. When finely shredded and squeezed, it adds moisture and fine green flecks that are barely visible against the dark chocolate batter.
Do I have to peel the zucchini?
No. The skin is tender, and in a dark batter the color is hidden.
Why are my brownies cakey?
Too much flour, overmixing, or too little fat is the usual cause. Measure the flour by spooning it into the cup and leveling it, and stop mixing as soon as no flour streaks remain.
Can I make them in an 8×8 pan?
Yes, but they will be thicker and need around 35 to 40 minutes. Check with a toothpick starting at 33 minutes.
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