Fudgy & Moist Chocolate Zucchini Cake Recipe

When summer rolls around and your garden is overflowing with zucchini, it is time to turn on the oven. This Fudgy Chocolate Zucchini Cake is the ultimate way to eat your greens . If you are skeptical about putting vegetables in your dessert, don’t worry—you cannot taste the zucchini at all! Instead, it acts as a magical ingredient that transforms a standard chocolate cake into the most tender, moist, and deeply rich chocolate experience you will ever have.

What is it

A Chocolate Zucchini Cake is a rich, dense chocolate sheet cake that incorporates finely grated raw zucchini into the batter. Zucchini is made of about 95% water, which means it releases incredible moisture into the cake as it bakes . The mild flavor of the squash is completely masked by cocoa powder, vanilla, and chocolate chips. It is traditionally baked in a 9×13-inch pan and topped with a thick layer of chocolate fudge frosting or a tangy cream cheese icing.

Why you’ll love it

• Unmatched Moisture: The zucchini guarantees that this cake will never be dry. It stays incredibly soft for days.
• Hidden Veggies: It is a fantastic way to sneak a serving of vegetables into a decadent dessert—perfect for picky eaters!
• No Mixer Required: The batter for this cake is incredibly simple and can be mixed entirely by hand in just two bowls .
• Crowd Pleaser: Baked in a 9×13 pan, it is easy to slice and serve to a large crowd at summer barbecues or potlucks.

Ingredients

To make this decadent 9×13-inch sheet cake, you will need:

• 2 cups all-purpose flour
• ¾ cup unsweetened natural cocoa powder
• 1 teaspoon baking soda and 1 teaspoon baking powder 
• ½ teaspoon kosher salt 
• 4 large eggs (at room temperature) 
• 1 ½ cups vegetable oil (or melted butter/coconut oil)
• 2 cups granulated sugar (or a mix of granulated and brown sugar)
• 1 teaspoon pure vanilla extract
• 3 cups finely grated zucchini (about 2-3 medium zucchinis)
• 1 cup semi-sweet chocolate chips (optional, but highly recommended!)

(Note: You will also need a batch of your favorite Chocolate Frosting to spread on top).

How to make

Step 1: Prep the Zucchini
Wash your zucchinis and trim the ends. There is no need to peel them! Grate the zucchini using the fine side of a box grater so the pieces melt seamlessly into the cake. Place the grated zucchini in a clean kitchen towel and gently squeeze out some of the excess liquid so your batter doesn’t become too watery.

Step 2: Mix the Wet and Dry Ingredients
Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking pan. In a large bowl, whisk together the eggs, vegetable oil, sugar, and vanilla extract until smooth . In a separate bowl, sift together the flour, cocoa powder, baking soda, baking powder, and salt.

Step 3: Combine and Fold
Pour the dry ingredients into the wet ingredients and mix just until combined. The batter will be very thick at this stage . Fold in the grated zucchini and the chocolate chips . As you stir, the moisture from the zucchini will loosen the batter to the perfect consistency .

Step 4: Bake
Pour the batter into your prepared pan and spread it into an even layer . Bake for 40 to 50 minutes, or until a toothpick inserted into the center comes out mostly clean, with just a few moist crumbs attached. Let the cake cool completely in the pan before frosting .

How To Serve

Once the cake is completely cool, spread a thick, generous layer of Fudge Frosting over the top [,]. If you prefer a tangier contrast to the rich chocolate, it is also phenomenal with a classic Cream Cheese Frosting. Slice it into squares and serve it at room temperature. It pairs beautifully with a cold glass of milk or a scoop of vanilla ice cream.

How To Store

Because this cake is so moist, it stores wonderfully. If you frosted it with a dairy-free chocolate buttercream, you can keep the cake covered tightly at room temperature for up to 2 days . If you used a cream cheese frosting, it must be stored in the refrigerator, where it will stay fresh and fudgy for up to 5 days . You can also freeze the unfrosted cake by wrapping it tightly in plastic wrap for up to 3 months.

FAQs

Do I have to squeeze the water out of the zucchini?
Yes, just a little bit! While you want the moisture, summer zucchinis can sometimes be too watery. Gently squeezing out the excess ensures your cake doesn’t turn out soggy or sink in the middle.

Why do I need to grate the zucchini finely?
Using the fine side of a cheese grater ensures the zucchini practically melts into the batter as it bakes . If you use a coarse grater, you might see noticeable green strings in your finished cake (which kids tend to spot immediately!) .

Can I make this as a layer cake instead of a sheet cake?
Yes! You can divide this batter evenly between two greased 8-inch or 9-inch round cake pans. Reduce the baking time to about 30-35 minutes, checking for doneness with a toothpick.

Note

Do not overbake this cake! Because it is baked in a wide 9×13 pan, it can dry out quickly if left in the oven too long . It is better to pull it out when there are still a few moist crumbs on the toothpick rather than waiting for it to come out completely dry.

Nutrition information

• Serving Size: 1 slice (approx. 1/15 of recipe, unfrosted)
• Calories: 310 kcal
• Carbohydrates: 42g
• Protein: 4g
• Fat: 16g
• Saturated Fat: 4g
• Sugar: 28g
• Sodium: 180mg
  *(Nutrition is an estimate based on a yield of 15 slices)*

Tips and Tricks

• If you want an incredibly fudgy, poke-cake style dessert, pierce the warm cake all over with a fork right out of the oven and drizzle ½ cup of chocolate syrup over it before it cools .
• To add a crunchy texture, fold 1 cup of chopped, toasted walnuts or pecans into the batter along with the zucchini.
• If you love sneaking veggies into your baking, you should also try a classic Carrot Cake Cobbler or a spiced Chocolate Beet Cupcakes recipe!