Dark Chocolate Sheet Cake: Rich Cocoa Dessert with Intense Flavor
Dark Chocolate Sheet Cake: Rich Cocoa Dessert with Intense Flavor
This dark chocolate sheet cake is the ultimate grown-up dessert for chocolate lovers who appreciate intense, sophisticated flavors. With its moist dark crumb and rich cocoa profile, this elegant sheet pan dessert offers a less sweet alternative to traditional chocolate cakes while still satisfying every chocolate craving. Perfect for parties, potlucks, or any gathering where you need to feed a crowd with minimal effort.
What makes this recipe special is its simplicity—no complicated techniques or fancy equipment required. The sheet pan method ensures even baking and easy serving, while the dark chocolate frosting adds a luxurious finish that elevates this humble cake to something truly special. If you’re looking for more crowd-pleasing desserts, check out our easy chocolate sheet cake with fudgy frosting for another simple option.
Ingredients
For the Cake:
- 2 cups all-purpose flour
- 1¾ cups granulated sugar
- ¾ cup unsweetened cocoa powder (dark or Dutch-processed)
- 2 teaspoons baking soda
- 1 teaspoon baking powder
- 1 teaspoon salt
- 2 large eggs, room temperature
- 1 cup buttermilk
- ½ cup vegetable oil
- 2 teaspoons vanilla extract
- 1 cup hot water
For the Dark Chocolate Frosting:
- ½ cup unsalted butter, softened
- ⅔ cup unsweetened cocoa powder
- 3 cups powdered sugar
- ⅓ cup milk
- 1 teaspoon vanilla extract
- Pinch of salt
Step-by-Step Instructions
Step 1: Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking sheet or jelly roll pan and set aside.
Step 2: In a large mixing bowl, whisk together the flour, sugar, cocoa powder, baking soda, baking powder, and salt until well combined.
Step 3: In a separate bowl, beat the eggs, then add the buttermilk, vegetable oil, and vanilla extract. Mix until smooth.
Step 4: Gradually add the wet ingredients to the dry ingredients, mixing on low speed until just combined. Be careful not to overmix.
Step 5: Slowly pour in the hot water while mixing on low speed. The batter will be thin—this is normal and will result in a moist cake.
Step 6: Pour the batter into the prepared baking sheet and spread evenly. Bake for 25-30 minutes, or until a toothpick inserted in the center comes out clean.
Step 7: While the cake cools, prepare the frosting. In a medium bowl, beat the softened butter until creamy. Add the cocoa powder and mix until combined.
Step 8: Gradually add the powdered sugar, alternating with the milk, and beat until smooth and spreadable. Stir in the vanilla extract and salt.
Step 9: Once the cake has completely cooled, spread the frosting evenly over the top. Cut into squares and serve.
Expert Tips
For the richest flavor: Use high-quality dark cocoa powder for both the cake and frosting. Dutch-processed cocoa will give you a deeper, less acidic chocolate flavor.
Moisture is key: Don’t skip the hot water—it helps bloom the cocoa powder and creates that signature moist texture. The thin batter is intentional and ensures even baking across the large surface area.
Cool completely: Make sure the cake is completely cool before frosting to prevent the frosting from melting and becoming messy.
Storage: Store covered at room temperature for up to 3 days, or refrigerate for up to a week. This cake also freezes well—wrap individual slices tightly and freeze for up to 3 months.
If you enjoy this simple oven-bake dessert, you might also love our ultimate one-bowl moist fudgy chocolate cake for another easy chocolate treat.
Frequently Asked Questions
Can I make this cake ahead of time?
Yes! This cake actually tastes better the next day as the flavors have time to develop. Bake it a day before your event for the best results.
Can I use regular cocoa powder instead of dark?
Regular cocoa powder will work, but the flavor will be less intense. For that grown-up chocolate experience, dark cocoa is recommended.
How many servings does this make?
This recipe yields about 20-24 generous servings, making it perfect for parties and gatherings. For more party dessert ideas, try our creamy party appetizers to complement your dessert spread.
Can I add nuts or other mix-ins?
Absolutely! Chopped walnuts, pecans, or chocolate chips can be folded into the batter before baking for added texture and flavor.
Looking for more chocolate inspiration? Our easy chocolate traybake offers another simple approach to crowd-pleasing chocolate desserts.
Dark Chocolate Sheet Cake: Rich Cocoa Dessert with Intense Flavor
Ingredients
Method
- Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking sheet or jelly roll pan and set aside.
- In a large mixing bowl, whisk together the flour, sugar, cocoa powder, baking soda, baking powder, and salt until well combined.
- In a separate bowl, beat the eggs, then add the buttermilk, vegetable oil, and vanilla extract. Mix until smooth.
- Gradually add the wet ingredients to the dry ingredients, mixing on low speed until just combined. Be careful not to overmix.
- Slowly pour in the hot water while mixing on low speed. The batter will be thin—this is normal and will result in a moist cake.
- Pour the batter into the prepared baking sheet and spread evenly. Bake for 25-30 minutes, or until a toothpick inserted in the center comes out clean.
- While the cake cools, prepare the frosting. In a medium bowl, beat the softened butter until creamy. Add the cocoa powder and mix until combined.
- Gradually add the powdered sugar, alternating with the milk, and beat until smooth and spreadable. Stir in the vanilla extract and salt.
- Once the cake has completely cooled, spread the frosting evenly over the top. Cut into squares and serve.
