Zucchini Spice Cake Recipe (Easy Zucchini Bars with Cream Cheese Frosting)
This zucchini spice cake is moist, warmly spiced, and topped with silky cream cheese frosting, the best zucchini bar recipe for using up garden zucchini in a crowd-pleasing dessert.
Why This Is the Best Zucchini Bar Recipe You'll Try
If you have ever ended up with more zucchini than you know what to do with, this zucchini spice cake is exactly the answer. It is soft, deeply spiced, and topped with a thick layer of tangy cream cheese frosting that turns a humble vegetable into a dessert people actually fight over. Think of it as a cross between classic zucchini bread and a carrot cake, baked into easy, shareable bars.
What makes this the best zucchini bar recipe in my rotation is how forgiving it is. There is no fussy technique, no stand mixer required, and the zucchini practically disappears into the crumb, leaving behind incredible moisture instead of any vegetable flavor. Even people who claim they do not like zucchini in dessert tend to go back for seconds.
Before we get cooking, the right tools and ingredients make a real difference here. A sturdy box grater makes quick work of the zucchini, a good 9x13 pan bakes these bars evenly, and full fat cream cheese is essential for a frosting that is rich instead of runny. These are the products that genuinely help this recipe shine:
Getting the Zucchini Right
The zucchini is the heart of this recipe, so a little prep goes a long way. Grate it on the large holes of a box grater, then squeeze it firmly in a clean kitchen towel or paper towels to remove excess liquid. Skipping this step is the number one reason zucchini bars turn out dense or gummy in the middle.
Chef's Tip: Do not skip squeezing the zucchini. Even a cup of extra liquid left behind can throw off the batter and leave you with a soggy bottom instead of a tender crumb.
If you want to riff on this and make carrot zucchini bars with frosting, simply swap half of the zucchini for shredded carrots, or use both as the recipe suggests. The warm spice blend of cinnamon, nutmeg, and a touch of clove works beautifully with either vegetable, which is part of why this recipe has become one of my favorite easy zucchini dessert ideas for using up a garden harvest.
Building the Batter
This is a one bowl, no mixer required kind of cake, which makes it one of the easiest zucchini bar recipes easy enough for a weeknight bake. Whisking the oil and sugars together first creates a smooth base, and adding the eggs one at a time keeps the batter emulsified so the bars bake up tender rather than oily.
Fold in the zucchini gently once the wet and dry ingredients are combined. Overmixing at this stage is the other common culprit behind tough zucchini bars, so stir just until the flour disappears.
A few ways people love to customize this zucchini bread bars base:
- Add a half cup of chopped walnuts or pecans for crunch
- Stir in a handful of raisins or golden raisins for natural sweetness
- Swap half the oil for unsweetened applesauce for a lighter bar
- Add orange zest to the batter for a brighter, more dessert forward flavor
Ready to make it? Here is the full step-by-step recipe:
Zucchini Spice Cake Recipe (Easy Zucchini Bars with Cream Cheese Frosting)
This zucchini spice cake is moist, warmly spiced, and topped with silky cream cheese frosting, the best zucchini bar recipe for using up garden zucchini in a crowd-pleasing dessert.
Ingredients
- 2 cups all-purpose flour, spooned and leveled
- 2 tsp ground cinnamon
- 1/2 tsp ground nutmeg
- 1/4 tsp ground cloves, optional, for extra warmth
- 1 tsp baking soda
- 1/2 tsp baking powder
- 1/2 tsp salt
- 1 cup granulated sugar
- 1/2 cup light brown sugar, packed
- 3/4 cup vegetable oil
- 3 large eggs, room temperature
- 1 tsp vanilla extract
- 2 cups shredded zucchini, packed, excess moisture squeezed out
- 1/2 cup shredded carrots, optional, for a carrot zucchini bar twist
- 1/2 cup chopped walnuts, optional
- 8 oz cream cheese, softened
- 1/4 cup unsalted butter, softened
- 2 cups powdered sugar, sifted
- 1/2 tsp vanilla extract, for the frosting
Instruction
Preheat the oven to 350 degrees F (175 degrees C). Grease a 9x13 inch baking pan or line it with parchment paper, leaving an overhang for easy lifting.
In a medium bowl, whisk together the flour, cinnamon, nutmeg, cloves, baking soda, baking powder, and salt. Set aside.
In a large bowl, whisk the granulated sugar, brown sugar, and vegetable oil together until well combined.
Add the eggs one at a time, whisking well after each addition, then stir in the vanilla extract.
Fold the shredded zucchini and carrots, if using, into the wet ingredients.
Add the dry ingredients to the wet ingredients and stir just until no streaks of flour remain. Fold in the chopped walnuts if using.
Pour the batter into the prepared pan and spread it into an even layer.
Bake for 28 to 32 minutes, or until a toothpick inserted in the center comes out clean or with just a few moist crumbs.
Cool the cake completely in the pan on a wire rack, about 1 hour, before frosting.
For the frosting, beat the cream cheese and butter together until smooth and creamy.
Add the powdered sugar and vanilla extract, and beat until light and fluffy.
Spread the frosting evenly over the cooled cake, slice into bars, and serve.
Equipment
- 9x13 inch baking pan
- Box grater
- Large mixing bowl
- Whisk
- Electric hand mixer
- Wire cooling rack
Notes
The Cream Cheese Frosting
No zucchini bar is complete without a generous layer of zucchini bars with cream cheese frosting on top. Make sure both the cream cheese and butter are properly softened before beating, this is what gives you a frosting that is smooth and pipeable rather than lumpy. Beat in the powdered sugar gradually so it does not fly everywhere, then finish with a touch of vanilla for depth.
Spread the frosting only after the cake has cooled completely. Warm cake will melt the frosting into a thin glaze instead of a thick, spreadable layer, which is a common mistake even with other zucchini bar recipes.
Serving and Storing
These bars slice cleanly once chilled for about 30 minutes after frosting, which also makes them easy to transport to a potluck or bake sale. Store leftovers covered in the refrigerator, where they stay moist and flavorful for up to five days.
For longer storage, freeze the unfrosted cake layer wrapped tightly in plastic wrap and foil for up to three months, then thaw and frost fresh whenever a craving hits. However you serve it, this zucchini spice cake proves that a bag of garden zucchini can turn into one of the most requested desserts in your recipe box.
