Chocolate Sheet Cake With Cocoa

Name: Chocolate Sheet Cake With Cocoa
Prep time: 20 min
Cook time: 30 min
Total time: 50 min
Yield: 12 servings
Ingredients: 1 cup unsalted butter, softened; 2 cups granulated sugar; 4 large eggs; 1 cup buttermilk; 2 cups all-purpose flour; 1 cup unsweetened cocoa powder; 1 teaspoon baking soda; 1/2 teaspoon salt; 1 teaspoon vanilla extract; 1/2 cup unsalted butter, softened; 2/3 cup unsweetened cocoa powder; 3 cups powdered sugar; 1/3 cup milk; 1 teaspoon vanilla extract

Highlighted under: Daily Cooking

I absolutely love baking, and this Chocolate Sheet Cake With Cocoa is one of my all-time favorites. Its rich, moist texture paired with a deeply chocolate flavor never fails to impress. I often make this cake for gatherings because it simplifies serving—there’s no fussing with layers. Instead, you get a delightful cut of cake that's perfect for birthdays, holidays, or any occasion that calls for a sweet treat. Plus, it comes together quickly, which is always a bonus in my busy kitchen!

Created by

Arden Whitlock

Last updated on 2026-03-17T23:28:40.433Z

Baking this Chocolate Sheet Cake With Cocoa has become a cherished tradition in my home. I remember the first time I made it; the house was filled with the most intoxicating aroma of melting chocolate and warm vanilla. It was a simple recipe, but the results were extraordinary. I realized that using high-quality cocoa really enhances the flavor, making each bite a delight.

Every time I serve this cake, I get compliments and requests for the recipe. It's become my go-to for potlucks and celebrations because of how easy it is to transport. I've learned that letting the cake cool completely before frosting results in a beautifully smooth finish, and I love adding a sprinkle of sea salt on top for an unexpected twist!

Why You'll Love This Cake

Rich chocolate flavor that satisfies every craving
Simple preparation with a magnificent presentation
Perfect for any celebration or casual gathering

The Importance of Cocoa

Cocoa powder is the star ingredient in this sheet cake, providing not only the deep chocolate flavor but also contributing to the cake's delightful moisture. Make sure to choose a high-quality unsweetened cocoa powder, as it can significantly affect the taste and texture of your cake. Dutch-processed cocoa will yield a milder flavor and darker color, while natural cocoa tends to be more acidic and has a stronger chocolate taste. Experiment to find your preferred cocoa type for future bakings.

When incorporating the cocoa into your batter, take care not to overmix. This can lead to a denser cake rather than the desired light and moist texture. Mixing until just combined will help keep air in the batter, creating a fluffier result. Also, don't be surprised if the batter seems thick; a thick batter generally leads to a rich cake with the right level of moisture.

Frosting Fundamentals

The frosting for this Chocolate Sheet Cake is just as crucial as the cake itself. Using unsweetened cocoa powder in the frosting balances the sweetness of the powdered sugar, creating a creamy and luscious topping that complements the cake beautifully. Be sure to sift the cocoa powder and powdered sugar together to avoid any lumps, ensuring a smooth and glossy frosting that spreads easily.

If you're looking to vary your frosting technique, you can experiment with adding a touch of coffee extract or espresso powder to enhance the chocolate flavor. A pinch of salt can also help to enrich the taste. For a creamier frosting, you can slightly increase the milk, but be cautious not to make it too runny; you want it to hold its shape on top of the cake.

Serving and Storage Tips

This Chocolate Sheet Cake is versatile in its serving options; you can enjoy it simply as it is, or dress it up with some fresh berries or a scoop of vanilla ice cream for an elevated dessert experience. When serving at a gathering, cut the cake into squares for easy distribution, and consider dusting with extra cocoa or powdered sugar for a polished finish.

For storage, keep any leftovers covered at room temperature for up to three days. If you need to store it for longer, refrigerate the frosted cake, which can last up to a week when wrapped tightly. You can also freeze the unfrosted cake by wrapping it well in plastic wrap and aluminum foil, preserving it for up to three months. Just allow it to thaw completely before frosting and serving.

Ingredients

Cake Ingredients

1 cup unsalted butter, softened
2 cups granulated sugar
4 large eggs
1 cup buttermilk
2 cups all-purpose flour
1 cup unsweetened cocoa powder
1 teaspoon baking soda
1/2 teaspoon salt
1 teaspoon vanilla extract

Frosting Ingredients

1/2 cup unsalted butter, softened
2/3 cup unsweetened cocoa powder
3 cups powdered sugar
1/3 cup milk
1 teaspoon vanilla extract

Instructions

Prepare the Cake Batter

Preheat your oven to 350°F (175°C). In a large mixing bowl, cream together the softened butter and granulated sugar until light and fluffy. Add the eggs one by one, mixing well after each addition. Stir in the buttermilk and vanilla extract.

Mix Dry Ingredients

In another bowl, whisk together the flour, cocoa powder, baking soda, and salt. Gradually add the dry mixture to the wet ingredients, mixing until just combined. Do not overmix.

Bake the Cake

Pour the batter into a greased sheet pan and smooth the top. Bake for 30 minutes or until a toothpick inserted in the center comes out clean. Allow the cake to cool completely before frosting.

Make the Frosting

In a mixing bowl, beat the softened butter until creamy. Gradually add the cocoa powder and powdered sugar, alternating with milk, until you reach the desired consistency. Stir in the vanilla extract.

Frost the Cake

Once the cake has cooled, spread the chocolate frosting evenly over the top. For an extra touch, sprinkle a bit of sea salt or chocolate shavings on top before serving.

Pro Tips

For an extra moist cake, you can replace some of the granulated sugar with brown sugar. Also, try using different types of cocoa powder for varied flavors.

Ingredient Substitutions

If you're in a pinch and don't have buttermilk on hand, you can easily make a substitute by mixing one cup of milk with a tablespoon of white vinegar or lemon juice. Let it sit for about 5-10 minutes to curdle before using it in your batter. This mimics the acidity of buttermilk, creating the same tender crumb in your cake.

For a dairy-free version, substitute the unsweetened butter with a plant-based alternative and use non-dairy milk along with a non-dairy yogurt to replace the buttermilk. The flavor will still shine through, and the texture of the cake will remain delightful.

Troubleshooting Common Issues

If your cake comes out dry, it may be a sign of overbaking. Keep an eye on it during the last few minutes of baking; the cake is done when a toothpick inserted into the center comes out with a few moist crumbs, not completely clean. Each oven varies, so you may need to adjust the time slightly depending on your equipment.

Another common issue is a sunken cake. This can occur if the batter is overmixed after adding the dry ingredients or if it is not baked long enough. The air bubbles created during mixing need to hold their structure while baking, so be gentle with the mixing and always do the toothpick test for doneness to ensure a perfect rise.

Make-Ahead Options

For added convenience, you can prepare the cake batter a day in advance and store it in the refrigerator. Just be sure to allow the batter to come to room temperature before pouring it into the sheet pan and baking, to help it rise properly. The flavors will actually deepen overnight, giving you a richer cake.

You can also frost the cake a day in advance. Just ensure it's kept covered in the refrigerator to maintain its freshness. Let it come to room temperature slightly before serving for the best flavor profile. This is a great way to save time the day of your event without sacrificing taste or quality.

Questions About Recipes

→ Can I make this cake ahead of time?

Absolutely! You can bake the cake a day in advance, just be sure to store it in an airtight container.

→ Is there a gluten-free version of this recipe?

Yes! You can substitute the all-purpose flour with a gluten-free flour blend that can accommodate baking.

→ How long can leftovers stay fresh?

The cake can last in the refrigerator for up to 3 days in an airtight container.

→ Can I freeze the cake?

Yes, you can freeze the unfrosted cake for up to 2 months. Just wrap it tightly in plastic wrap.