Ultimate Indulgent Chocolate Sheet Cake – Easy Crowd-Pleasing Dessert

This indulgent chocolate sheet cake is the ultimate dessert for any occasion! With its rich, moist crumb and decadent fudgy icing, this easy one-bowl recipe comes together in minutes and feeds a crowd perfectly. Whether you’re hosting a party, bringing dessert to a potluck, or simply craving something chocolatey, this celebration sheet cake delivers incredible flavor with minimal effort.

The beauty of this sheet cake recipe lies in its simplicity – no fancy equipment or complicated techniques required. Just mix, pour, bake, and frost for a dessert that will have everyone coming back for seconds!

Ingredients

For the Cake:

• 2 cups all-purpose flour
• 2 cups granulated sugar
• 1 cup unsweetened cocoa powder
• 2 teaspoons baking soda
• 1 teaspoon baking powder
• 1 teaspoon salt
• 2 large eggs
• 1 cup buttermilk
• 1 cup vegetable oil
• 2 teaspoons vanilla extract
• 1 cup boiling water

For the Fudgy Icing:

• 1/2 cup butter
• 4 tablespoons unsweetened cocoa powder
• 6 tablespoons milk
• 1 teaspoon vanilla extract
• 4 cups powdered sugar

Step-by-Step Instructions

Step 1: Preheat your oven to 350°F (175°C). Grease a 9×13 inch baking pan and set aside.

Step 2: In a large mixing bowl, whisk together flour, sugar, cocoa powder, baking soda, baking powder, and salt until well combined.

Step 3: Add eggs, buttermilk, vegetable oil, and vanilla extract to the dry ingredients. Mix on medium speed until just combined.

Step 4: Carefully pour in the boiling water and mix until the batter is smooth and thin. The batter will be runny – this is normal!

Step 5: Pour the batter into the prepared pan and bake for 30-35 minutes, or until a toothpick inserted in the center comes out clean.

Step 6: While the cake cools, prepare the icing. In a medium saucepan, melt butter over medium heat. Whisk in cocoa powder until smooth.

Step 7: Add milk and vanilla, then gradually whisk in powdered sugar until the icing is smooth and pourable.

Step 8: Pour the warm icing over the slightly cooled cake, spreading it evenly across the surface. Allow the icing to set before slicing and serving.

Expert Tips

For the most rich chocolate flavor, use high-quality cocoa powder. The boiling water helps bloom the cocoa, intensifying its flavor and creating that signature moist texture.

Don’t overmix the batter after adding the boiling water – just mix until combined to avoid developing too much gluten, which can make the cake tough.

This cake is perfect for potluck gatherings and large parties since it serves 12-16 people easily. The sheet pan format makes it simple to transport and serve.

Frequently Asked Questions

Can I make this cake ahead of time?
Yes! This chocolate sheet cake actually tastes better the next day as the flavors continue to develop. Store it covered at room temperature.

What can I use instead of buttermilk?
If you don’t have buttermilk, you can make a substitute by adding 1 tablespoon of lemon juice or vinegar to 1 cup of milk and letting it sit for 5 minutes.

How should I store leftovers?
Store covered at room temperature for up to 3 days, or in the refrigerator for up to a week. This cake also freezes well for up to 3 months.

For more easy dessert recipes that are perfect for entertaining, check out our collection of simple treats that deliver maximum flavor with minimal effort!

Ultimate Indulgent Chocolate Sheet Cake – Easy Crowd-Pleasing Dessert

This indulgent chocolate sheet cake features a rich, moist crumb with decadent fudgy icing, making it the perfect dessert for any occasion. The easy one-bowl recipe comes together quickly and feeds a crowd with minimal effort.

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 35 minutes mins

Total Time 50 minutes mins

Servings: 12 servings

Calories: 380

Ingredients Method Notes

Ingredients

  

Ingredients

• 2 cups all-purpose flour
• 2 cups granulated sugar
• 1 cup unsweetened cocoa powder
• 2 teaspoons baking soda
• 1 teaspoon baking powder
• 1 teaspoon salt
• 2 large eggs
• 1 cup buttermilk
• 1 cup vegetable oil
• 2 teaspoons vanilla extract
• 1 cup boiling water
• 1/2 cup butter
• 4 tablespoons unsweetened cocoa powder
• 6 tablespoons milk
• 1 teaspoon vanilla extract
• 4 cups powdered sugar

Method

 

Instructions

1. Preheat your oven to 350°F (175°C). Grease a 9×13 inch baking pan and set aside.
2. In a large mixing bowl, whisk together flour, sugar, cocoa powder, baking soda, baking powder, and salt until well combined.
3. Add eggs, buttermilk, vegetable oil, and vanilla extract to the dry ingredients. Mix on medium speed until just combined.
4. Carefully pour in the boiling water and mix until the batter is smooth and thin. The batter will be runny – this is normal!
5. Pour the batter into the prepared pan and bake for 30-35 minutes, or until a toothpick inserted in the center comes out clean.
6. While the cake cools, prepare the icing. In a medium saucepan, melt butter over medium heat. Whisk in cocoa powder until smooth.
7. Add milk and vanilla, then gradually whisk in powdered sugar until the icing is smooth and pourable.
8. Pour the warm icing over the slightly cooled cake, spreading it evenly across the surface. Allow the icing to set before slicing and serving.

Notes

Use high-quality cocoa powder for the richest chocolate flavor. Don’t overmix the batter after adding boiling water. The cake tastes better the next day as flavors develop. Can substitute buttermilk with 1 tbsp lemon juice or vinegar + 1 cup milk.