★★★★★

Chocolate Zucchini Brownies

Rich and decadent Chocolate Zucchini Brownies are made extra moist with grated zucchini. Topped with a decadent fudge frosting, these fudgy brownies are easy to make in one bowl!

As much as we all love Roasted Zucchini as a side dish, let’s focus on some sweets. We love this Chocolate Chip Zucchini Bread and Zucchini Banana Bread. What’s your favorite zucchini recipe?

Slices of chocolate frosted zucchini brownies on white dessert plates.

Why this Recipe is Best

  • Grated zucchini makes chocolate brownies unbelievably moist.
  • Works well with fresh OR frozen zucchini.
  • Topped with dreamy chocolate fudge frosting!

If you’ve never added zucchini to your chocolate desserts before, you’re in for a treat. This recipe is the perfect way to use up any extra zucchini you have in your fridge.

Bonus: these are so easy to make! The brownie batter comes together in one mixing bowl in a matter of minutes.

If you LOVE frosted brownies, you’ve got to try them with zucchini too.

Ingredient Notes

Ingredients needed for chocolate zucchini brownies.

Cocoa powder. A good quality chocolate cocoa powder, such as Hershey’s Special Dark or Ghirardelli is best.

Vegetable oil. A higher fat to flour ratio keeps these brownies incredibly moist and fudgy.

Unsalted butter. If using salted butter, omit the extra kosher salt in the recipe.

Vanilla extract. As always, choose a pure vanilla and not imitation vanilla. Our homemade vanilla extract is easy to make, and affordable too!

Shredded zucchini. See instructions below for the best way to grate zucchini. If using frozen zucchini, be sure to squeeze out the excess moisture, THEN measure the amount needed. Choose smaller zucchinis if possible as they retain much more moisture than those overside large zucchini (which tend to be more dry and perfect for freezing).

How to Grate Zucchini

The first step to making chocolate brownies with zucchini is to grate the zucchini well. After washing your zucchini, cut off the stems. (Peeling is optional but not necessary.)

If you have extra large zucchini, scoop out those big seeds from the middle.

A food processor with a grater attachment is the easiest and fastest way to grate zucchini. Start the food processor and feed the zucchini in vertically while it’s running.

You can also grate it the old fashioned way with a big box grater: Hold the zucchini up against the grater placed over a large bowl. Run the zucchini down the side of the grater just like you would a block of cheese.

I don’t recommend using a fine microplane zester or a food processor with blades. Both will make the zucchini more pureed and watery than grated and it won’t work as well in the brownies.

Once your zucchini is grated, it’s time to bake some brownies!

Step by step photos showing how to make double chocolate zucchini brownies.

Tips & Tricks

  • Let the batter rest. The brownie batter will look very dry when it first comes together. This is normal. Let it sit for 10 minutes before pouring it to the baking dish. The moisture from the zucchini will release into the batter as it rests. Trust me!
  • Cut brownies with a clean plastic knife. The plastic knife makes perfectly even cuts–no crumbling! Be sure to let the brownies cool completely before cutting them!
  • Store tightly covered. At room temperature, these chocolate zucchini brownies stay good for 4 -5 days.
  • Additions: Add some chocolate chips or walnuts pieces to the batter before baking for a delicious dreamy brownie.
  • Try our chocolate chip frosted zucchini brownies for a delicious twist!
Fudgy brownie bite with frosting.

Recipe FAQs

What size pan do I need to make zucchini brownies?

This recipe was tested in a 9 x 13 inch baking dish.

Why is my batter so dry?

The batter is supposed to be quite dry before you add the zucchini. Stir in the zucchini then let it rest for 10 minutes and it’ll start to be softer and more workable.

Can I use milk instead of heavy cream in the frosting?

You can use milk if you want but the frosting won’t be as thick and creamy. I highly recommend real heavy whipping cream here!

13x9 baking dish with frosted zucchini brownies, cut into squares.

Double Chocolate Zucchini Brownies

These fudgy brownies are topped with a delicoius fudgy frosting.

It’s easy to make too! Combine melted butter with cocoa powder in a small bowl with a whisk. Add in powdered sugar, heavy cream and vanilla. Whisk until smooth.

Spread over cooled brownies. Cut into bars and enjoy!! You could also make a half batch of our creamy chocolate buttercream frosting. Or give our vanilla frosting recipe a try instead!

More Zucchini Recipes

Yield: 20 brownies

Chocolate Zucchini Brownies

Prep Time 15 minutes
Cook Time 25 minutes
Total Time 40 minutes

Rich and decadent Chocolate Zucchini Brownies are made extra moist with grated zucchini. Topped with a decadent fudge frosting, these fudgy brownies are easy to make in one bowl!

Ingredients

For the Brownies:

  • ½ cup vegetable oil
  • 1 cup granulated sugar
  • ½ cup light brown sugar, packed
  • 2 teaspoons vanilla extract
  • 2 cups all-purpose flour
  • ½ cup dark chocolate unsweetened cocoa powder
  • 1 ½ teaspoon baking soda
  • 1 teaspoon kosher salt
  • 2 ½ cups cup finely shredded zucchini

For the Frosting:

  • ¼ cup unsalted butter, melted
  • 5 Tablespoons dark chocolate unsweetened cocoa powder
  • 2 cups powdered sugar
  • 6 Tablespoons heavy whipping cream
  • ½ teaspoon vanilla extract

Instructions

  1. Preheat oven to 350 degree F. Line a 13x9 baking dish with parchment paper. Set aside.
  2. For the brownies, in a large bowl, combine oil, sugars, and vanilla extract. Add in flour, cocoa powder, baking soda and salt. Stir together until well blended. The batter will be very dry, it's okay!!
  3. Fold in shredded zucchini. Depending on the moisture of your zucchini, your batter may still be slightly dry. Let batter sit 10 minutes before pouring into baking dish.
  4. Bake for 25-30 minutes until cooked. Remove and cool completely before frosting.
  5. For the frosting, combine the melted butter with cocoa powder in a small bowl with a whisk. Add in powdered sugar, heavy cream and vanilla. Whisk until smooth. Spread over cooled brownies. Cut into bars and enjoy!!

Notes

    • Let the batter rest. The brownie batter will look very dry when it first comes together. This is normal. Let it sit for 10 minutes before pouring it to the baking dish. The moisture from the zucchini will release into the batter as it rests. Trust me!
    • Cut brownies with a clean plastic knife. The plastic knife makes perfectly even cuts--no crumbling! Be sure to let the brownies cool completely before cutting them!
    • Store tightly covered. At room temperature, these chocolate zucchini brownies stay good for 4 -5 days.
    • Additions: Add some chocolate chips or walnuts pieces to the batter before baking for a delicious dreamy brownie.
    • Try our chocolate chip frosted zucchini brownies for a delicious twist!

Nutrition Information:

Yield:

20

Serving Size:

1 brownie

Amount Per Serving: Calories: 284Total Fat: 12gSaturated Fat: 5gTrans Fat: 0gUnsaturated Fat: 7gCholesterol: 12mgSodium: 163mgCarbohydrates: 41gFiber: 1gSugar: 30gProtein: 2g

*Nutrition facts are an estimate and not guaranteed to be accurate. Please see a registered dietitian for special diet advice.

Did you make this recipe?

Please leave a comment on the blog or share a photo on Instagram

Don’t waste any zucchini ever again. Make Chocolate Zucchini Brownies covered in a fudgy ganache frosting instead!

About Aimee

Aimee is a dessert lover (specifically rice krispie treats), workout enthusiast, self-taught foodie, and recipe creator.

Learn more about Aimee.

Affiliate Disclosure:**There may be affiliate links in this post! By clicking on them, or purchasing recommended items I may receive a small compensation. However, I only recommend products I love! Thank you for supporting Shugary Sweets! See my disclosure policy for more info**

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Posted on September 1, 2021

Comments & Reviews

  1. Just made today and these are AMAZING! This icing might be the best chocolate icing I’ve ever made 🙂 Thanks for the fantastic recipe! It’s a winner for sure!

  2. Have you ever dozen diced zucchini for your zucchini apple crisp ?just put 3 at bags of it in the freezer . I like your recipe foe apple crisp that I am going to make today, an tomorrow the brownies.

    1. Haha! I have a zucchini Crumble recipe on the blog here: https://www.shugarysweets.com/zucchini-crumble

  3. Just took these out of the oven, they smelled soooo good I had to eat one, and I was not disappointed!  Moist, fudgey and perfect.  Love that I could put 2 cups of zucchini in them.  I added a cup of pecans, I need nuts in my brownies.  Thanks for the great recipe, it is a keeper. Now if I can just leave them to cool for the frosting………..

  4. My mind is drawing a blank this week with back-to-school and coming back from vacation.  Isn’t it nice to just make a great recipe and not stress about being creative?  These look so delicious, and I love the idea of making brownies with zucchini! 🙂 

  5. These look way fudgier than any zucchini brownies I’ve had before! I actually haven’t gotten any zucchini to bake with this year and it feels wrong – normally family and friends are dumping piles on us!

  6. We left our beautiful garden behind in NC when we moved! Time to buy some seeds for a new garden. Bring on the zucchini recipes! I am loving it!

  7. Dear Aimee – these are gorgeous brownies. I could eat a plateful. I love cocoa powder in frosting. I’m a tad jealous re: your zucchini plant though. Mine is doing this year what you predict yours might next year.  Death by some horrible plant eating bug. Both plants actually. Guess it’s time for a trip to the Farmer’s Market so this black thumb can make these amazing brownies….

    1. Seriously, I think every other year my veggies die by some slow death. I got lucky this year 🙂

  8. I haven’t cooked with, baked with, or even eaten any zucchini this summer! I have no idea why…. I guess because I didn’t join a farm share this year. These brownies look INCREDIBLE!

  9. I have never baked with zucchini before but I think I better hop to it! These brownies look so delicious! Talk about delicious!

  10. I could never get sick of delicious zucchini recipes and these brownies certainly look like da bomb!  Love how fudgey and chocolately they are!  Plus I adore your substitution of brown sugar (<–YESS!)!  And that frosting?  I could eat that with a spoon!  These are a scrumptious way to use up all that extra zucchini!  LOVE IT!  Cheers!  

  11. I for one am not tired of zucchini recipes, probably because I have a ridiculous amount of them coming out of my garden daily! The brownies are a must make, although I’m pretty sure that frosting would be eaten before it made it on top of the brownies!

  12. I’m definitely not sick of zucchini recipes. Keep ‘me coming! And while you’re at it, could you send some of these brownies too, please? 😉

  13. Love how fudgy these brownies look! The perfect way to use up all of the zucchini that is available right now!

  14. Zucchini in brownies!?!?! Beyond brilliant! I’ll be over with a plate in 5 minutes =) I’ll never tire of zuke recipes and cannot wait to start my garden once we move!

  15. I definitely saw your zucchini baking shenanigans, and I LOVE IT. Keep ALL the zucchini coming! Especially when you turn them into these bad boys. I mean, there’s vegetables in there. They must be healthy right?
    Pinned!

  16. If your mind drew a blank, that is definitely rare. I remember you telling me that the baking ideas are always flowing forth!
    But hey, the baker’s block produced these brownies, so that’s amazing. They look so good!
    BTW, made a coffee granita yesterday and it reminded me of you. You’re the coffee girl!

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