Cinnamon Frosted Zucchini Cake Bars

Easy and delicious, these chewy Cinnamon Frosted Zucchini Cake Bars are the perfect sweet dessert any time of year! Serve chilled for extra flavor!

Easy and delicious, these chewy Cinnamon Frosted Zucchini Cake Bars are the perfect sweet dessert any time of year! Serve chilled for extra flavor!

I have a confession. I lied to you guys. But not on purpose.

A couple weeks ago I told you that my Chocolate Zucchini Cupcakes were the last of my zucchini recipes.

It clearly wasn’t true. But here’s the thing. It’s September and here in Chicago the weather has been crazy warm hot. Unseasonably warm. And my zucchini plant surprised me.

While I thought I had harvested the last of those suckers, there were a few more late arrivals. Zucchini plants are the old faithful of my garden! They always have more to give.

And so, here we are, with another delicious zucchini recipe to add to your recipe box.

While YOUR garden may be done growing, you can still buy zucchini at the grocery store, you know, in case you get a taste for this delicious cake bar recipe!

Back to today’s Cinnamon Frosted Zucchini Cake Bars….these are chewy, yet moist.

I would say a cross between a cookie bar and a slice of cake. They’re also super sweet thanks to that thick pile of Cinnamon frosting on top!

Not a fan of  lots of frosting? You can totally cut the frosting in half, if you’re *that* kind of a person.

Me? The more frosting the better. I can never have enough of this fluffy buttercream flecked with cinnamon!

I like it piled high on my bars. Actually, I’d probably be happy eating a bar that’s more frosting than cake, if I thought I could get away with it.

So if you do decide to go with half the cinnamon frosting, feel free to send the rest my way. I will happily finish it off for you.

Easy and delicious, these chewy Cinnamon Frosted Zucchini Cake Bars are the perfect sweet dessert any time of year! Serve chilled for extra flavor!

Zucchini Cake Bars

Cake bars are even easier to make than most cake recipes and the bar form makes them extra convenient for transport.

You fold shredded zucchini into a thick batter of brown sugar, melted butter, eggs and flour. Don’t forget a few drops of vanilla extract!

Then, you just bake, cool, frost and slice! These are oh-so-chewy–almost like a good fudgy brownie. They’re a hit as a dessert, but you all know I’m a big proponent of cake bars for breakfast, too.

A zucchini bar with a strong cup of dalgona coffee in the morning? Swoon worthy.

Cinnamon Frosting

To make the lightest, fluffiest cinnamon frosting, beat your softened butter for about 3 minutes, using the whisk attachment on an electric mixer. It will turn pale in color.

THEN add in your sugar, cinnamon, and milk and beat until fluffy again! Beating the butter on its own first makes this cinnamon buttercream super light and fluffy.

I like to use my stand mixer fitted with the whisk attachment. Electric beaters work well, too.

This frosting is just so good, you guys. Words hardly do it justice!

Tips and Tricks

  • Be sure to line your pan with parchment paper. These chewy bars can be sticky, and there’s nothing worse than not being able to get them out of the pan. Plus it makes them easy to cut and frost too!
  • Make sure your zucchini is shredded and not pureed! A box grater works beautifully for shredding zucchini. A food processor with a grating attachment is a nifty method, too. Be sure not to over process or it could get mushy.
  • If using freshly shredded zucchini, proceed as normal. If using FROZEN, thawed zucchini, you’ll want to squeeze out all that excess moisture. Put your zucchini in a piece of cheesecloth, or a very thin towel. Wring the cloth at the top and keep wringing it until all the liquid seeps out (oh, and be sure to do this over the sink, haha)!
  • Allow your bars to cool completely before adding the frosting.

How to Store Zucchini Cake Bars

I love eating these cold. The cool temperature seems to make the cinnamon flavor in the frosting even more noticeable. Fridge storage also ensures my frosting won’t get too soft and runny, even on the warmest summer days.

You can keep them in the pan covered with foil or plastic wrap, or transfer the bars to a tupperware container.

Zucchini cake bars freeze well too!

Store in a freezer safe container with a sheet of wax paper between each layer of bars. Thaw at room temperature before enjoying.

Freezer Friendly Zucchini Recipes

So, go ahead and make several batches of these bars to store in the freezer!

While you’re add it, make some Easy Freezer Friendly Zucchini Blueberry Bread Recipe for good measure, too!

More Easy Bar Recipes

Yield: 16 servings

Cinnamon Frosted Zucchini Cake Bars

Prep Time 10 minutes
Cook Time 30 minutes
Additional Time 20 minutes
Total Time 1 hour

Easy and delicious, these chewy Cinnamon Frosted Zucchini Cake Bars are the perfect sweet dessert any time of year!


For the cake bars:

  • 1 cup light brown sugar, packed
  • ½ cup unsalted butter, melted
  • 1 large egg
  • 1 tsp vanilla extract
  • 1 cup all-purpose flour
  • ¼ tsp kosher salt
  • ½ tsp cinnamon
  • 1 cup shredded zucchini

For the frosting:

  • ½ cup unsalted butter, softened
  • 2 ½ cups powdered sugar
  • 1 tsp cinnamon
  • 2-3 Tbsp milk


  1. Preheat oven to 350°F. Line a 9-inch baking dish with parchment paper, set aside.
  2. In a mixing bowl, combine the brown sugar with melted butter. Add in egg and vanilla. Add flour, salt, cinnamon just until combined. Fold in the zucchini.
  3. Pour batter into prepared dish. Bake for 26-30 minutes, remove from oven and cool completely before frosting.
  4. For the frosting, beat butter with powdered sugar, cinnamon, and milk. Scraping down the sides of the bowl, beat until fluffy, about 3-5 minutes. Spread over cooled cake bars. Refrigerate and enjoy!

Nutrition Information:



Serving Size:


Amount Per Serving: Calories: 251Total Fat: 12gSaturated Fat: 7gTrans Fat: 0gUnsaturated Fat: 4gCholesterol: 43mgSodium: 49mgCarbohydrates: 35gFiber: 0gSugar: 28gProtein: 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?

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This recipe is one more reason to keep that garden going for as long as you can. You’ll love these easy, delicious Zucchini Cake Bars so much, you may find yourself buying zucchini all winter long. Enjoy!

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 28, 2017

Comments & Reviews

  1. Hi, I made these zucchini bars and I have a couple of recommendations. I like my food to have balance. I don’t like one part of it to be drowning out the other tastes. The cinnamon frosting had a bit too much cinnamon for my taste. I would reduce the cinnamon by 25%. The frosting was overwhelming. I frosted the bars and the layer of frosting was thicker than the layer of the zucchini bar. It would be more than enough if you cut the frosting recipe in half. The zucchini bar itself was delicious. I would increase the amount of all ingredients in the zucchini bars by about 25% so that you get a thicker bar.
    When you use a complimentary amount o f deliciously flavored frosting, the bars are great.
    They really good after refrigerating for several hours.

  2. Hi. Okay, i am not a big zucchini fan, but I have to give these a try!!!  Yummy. ????. You only said to squeeze out the water if using frozen so I assume I don’t squeeze out the fresh zucchini, right?  Thanks.   (I haven’t baked a lot with zucchini)

  3. Love how chewy and gooey these cake bars look:)  YUM!  I know this is basically blasphemy, but I’m not a big buttercream frosting fan, thinking of doing a hefty layer of a greek-yogurt frosting for some tang, do you think those flavors would would work well here?  

    1. Yes! But that sounds like so much work, LOL. Baking in my pajamas and sharing the recipe online is so much easier 🙂

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