Zucchini Brownies

Section: Indulgent Desserts for Sweet Endings

These zucchini brownies transform fresh summer zucchini into decadently moist chocolate squares topped with rich frosting. The secret ingredient adds incredible moisture while keeping the chocolate flavor front and center. Perfect for using up garden abundance, these brownies bake in just 25 minutes and feed a crowd with their generous 9x13 pan size. The simple frosting made with cocoa powder and butter creates the perfect finishing touch.

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Published By Ioana
Updated on Tue, 12 Aug 2025 17:18:07 GMT
A plate of brownies with chocolate and nuts. Bookmark
A plate of brownies with chocolate and nuts. | ioanacooks.com

These zucchini brownies are the perfect blend of rich chocolate flavor and tender, moist texture, with a subtle vegetable boost that no one will suspect. They are a smart way to use up extra zucchini and make a dessert that feels indulgent yet has a touch of wholesomeness.

I first baked these when my zucchini harvest went wild one year and they quickly became my go to dessert for potlucks and picnics. My friends were shocked when I told them what was inside.

Ingredients

  • White sugar: adds sweetness and structure choose fine granulated for even mixing
  • Vegetable oil: keeps the brownies moist and tender opt for a neutral flavored oil
  • Vanilla extract: enhances chocolate flavor use pure extract for best taste
  • All purpose flour: provides the base for the brownies choose unbleached for a softer crumb
  • Unsweetened cocoa powder: gives deep chocolate flavor choose a high quality brand for rich taste
  • Baking soda: helps the brownies rise and stay light be sure it is fresh
  • Salt: balances sweetness and enhances flavor fine sea salt works well
  • Shredded zucchini: adds moisture and a soft texture choose small to medium zucchini for tender shreds
  • Chopped walnuts: give crunch and nutty depth choose fresh walnuts and store in the fridge to avoid bitterness

Frosting ingredients

  • Unsweetened cocoa powder: adds more chocolate punch
  • Butter: creates a smooth rich base use unsalted for better control over flavor
  • Confectioners sugar: gives sweetness and smooth texture sift before using to avoid lumps
  • Milk: thins the frosting to spreadable consistency whole milk adds richness
  • Vanilla extract: rounds out the frosting flavor

Step by Step Instructions

Sauté the Aromatics:
Mix the sugar oil and vanilla extract in a large bowl until well blended ensuring the sugar dissolves slightly into the oil which helps the brownies stay tender
Combine the Dry Ingredients:
In another bowl whisk together flour cocoa powder baking soda and salt until evenly mixed so no clumps remain
Fold in the Zucchini and Walnuts:
Gently stir the dry mixture into the wet until just combined then fold in shredded zucchini and chopped walnuts making sure every bite will have a bit of both
Bake the Brownies:
Spread the batter evenly into a greased and floured 9 by 13 inch pan bake in a preheated 350 degree oven for 25 to 30 minutes until the top looks dry and the edges pull away from the pan cool for about 20 minutes
Make the Frosting:
Melt butter with cocoa powder in a saucepan over medium low heat whisking until glossy let cool slightly blend confectioners sugar milk and vanilla then stir into cocoa mixture until smooth spread evenly over cooled brownies before cutting into squares
A stack of brownies with nuts on top. Bookmark
A stack of brownies with nuts on top. | ioanacooks.com

My favorite part is how the zucchini melts into the batter leaving no trace except a soft tender crumb. My kids still cannot believe these brownies have vegetables in them and they always disappear faster than I expect.

Storage Tips

Store brownies in an airtight container at room temperature for up to three days or in the refrigerator for up to a week. For longer storage freeze individually wrapped squares and thaw at room temperature.

Ingredient Substitutions

Swap walnuts for pecans or omit for a nut free version. Use whole wheat pastry flour for a heartier texture or replace half the oil with applesauce for a lighter treat.

Serving Suggestions

Serve warm with a scoop of vanilla ice cream or drizzle with raspberry sauce for a fruity twist. They also make a great base for ice cream sandwiches.

Cultural and Historical Context

Zucchini based desserts became popular in the late 20th century as gardeners looked for ways to use abundant summer crops. Today they are beloved for their moisture and subtle sweetness.

A plate of brownies with nuts on top. Bookmark
A plate of brownies with nuts on top. | ioanacooks.com

Frequently Asked Questions About Recipes

→ Can you taste the zucchini in these brownies?

Not at all! The zucchini adds incredible moisture and a tender texture, but the chocolate flavor completely masks any vegetable taste. Even picky eaters won't detect the hidden veggie.

→ Do I need to peel the zucchini before shredding?

No, you can leave the peel on when shredding. The thin green flecks actually add nice color and extra nutrients without affecting the taste or texture.

→ Can I make these brownies without the frosting?

Absolutely! These brownies are delicious on their own. You can dust them with powdered sugar, serve with vanilla ice cream, or enjoy them plain for a less sweet option.

→ How should I store leftover zucchini brownies?

Store covered at room temperature for up to 3 days or in the refrigerator for up to a week. The frosting may soften slightly at room temperature but will firm up when chilled.

→ Can I freeze these brownies?

Yes! Wrap individual squares in plastic wrap and freeze for up to 3 months. Thaw at room temperature before serving. The texture remains perfectly moist after freezing.

→ What's the best way to shred zucchini for brownies?

Use the large holes of a box grater or the shredding disc of a food processor. Don't squeeze out the moisture - you want all that natural liquid to keep the brownies tender.

Zucchini Brownies

Moist chocolate brownies made with shredded zucchini and topped with creamy chocolate frosting for the perfect treat.

Time Needed to Prep
15 minutes
Cooking Duration
25 minutes
Overall Time
40 minutes
Published By: Ioana

Category of Recipe: Desserts

Preparation Difficulty: Easy to Make

Type of Cuisine: American

Number of Portions: 24 How Many It Serves (1 (9x13-inch) pan)

Dietary Preferences: Made for Vegetarians

Ingredients You'll Need

→ Brownie Base

Ingredient 01 1½ cups white sugar
Ingredient 02 ½ cup vegetable oil
Ingredient 03 2 teaspoons vanilla extract
Ingredient 04 2 cups all-purpose flour
Ingredient 05 ½ cup unsweetened cocoa powder
Ingredient 06 1½ teaspoons baking soda
Ingredient 07 1 teaspoon salt
Ingredient 08 2 cups shredded zucchini
Ingredient 09 ½ cup chopped walnuts

→ Chocolate Frosting

Ingredient 10 6 tablespoons unsweetened cocoa powder
Ingredient 11 ¼ cup butter
Ingredient 12 2 cups confectioners' sugar
Ingredient 13 ¼ cup milk
Ingredient 14 ½ teaspoon vanilla extract

Steps to Follow

Step 01

Preheat oven to 350°F (175°C). Grease and flour a 9x13-inch baking pan, ensuring complete coverage to prevent sticking.

Step 02

In a large bowl, mix sugar, vegetable oil, and 2 teaspoons vanilla extract together until well blended and smooth.

Step 03

In a separate bowl, whisk together flour, ½ cup cocoa powder, baking soda, and salt until evenly distributed. Gradually stir dry mixture into the wet ingredients until just combined.

Step 04

Gently fold in shredded zucchini and chopped walnuts until evenly distributed. Spread batter evenly into the prepared baking pan.

Step 05

Bake for 25 to 30 minutes until the top is dry and edges begin to pull away from the sides. Cool completely in pan for about 20 minutes.

Step 06

While brownies cool, whisk 6 tablespoons cocoa powder and butter in a small saucepan over medium-low heat until smooth and glossy. Set aside to cool.

Step 07

Blend confectioners' sugar, milk, and ½ teaspoon vanilla extract together. Stir into the cooled cocoa mixture until smooth. Spread evenly over cooled brownies before cutting into squares.

Extra Tips

  1. Do not squeeze moisture from shredded zucchini as it adds natural moisture to the brownies
  2. Brownies can be made without frosting and dusted with powdered sugar instead
  3. For best results, cool brownies completely before frosting to prevent melting

Tools You'll Need

  • 9x13-inch baking pan
  • Large mixing bowl
  • Medium mixing bowl
  • Small saucepan
  • Whisk
  • Box grater or food processor for shredding zucchini

Allergen Information

Carefully check food labels for allergens and consult an expert if you're uncertain.
  • Contains gluten from all-purpose flour
  • Contains dairy from butter and milk
  • Contains tree nuts from walnuts

Nutritional Information (Per Serving)

Remember, these values are for guidance only and shouldn't replace advice from a professional.
  • Calories Per Serving: 209
  • Total Fat: 9 grams
  • Carbohydrate Amount: 33 grams
  • Protein Amount: 2 grams