Easy Chocolate Sheet Cake with Fudgy Frosting: The Perfect One-Pan Dessert

Easy Chocolate Sheet Cake with Fudgy Frosting: The Perfect One-Pan Dessert
Looking for a dessert that’s easy to make but delivers maximum chocolate satisfaction? This classic chocolate sheet cake is your answer! With its moist, tender crumb and rich fudgy frosting, it’s the ultimate crowd-pleaser for any occasion. Whether you need a quick weeknight treat or a show-stopping dessert for your next gathering, this one-pan wonder comes together in minutes and serves a crowd effortlessly.
What makes this recipe so special is its simplicity. You mix the batter right in the baking pan, bake until perfectly risen, and top with an irresistible fudgy frosting that sets up beautifully. It’s the kind of dessert that brings people together—perfect for potlucks, family celebrations, or simply satisfying that chocolate craving.

Ingredients
For the Cake:
- 2 cups all-purpose flour
- 2 cups granulated sugar
- ¾ 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
- 1 cup hot water
- 2 teaspoons vanilla extract
For the Fudgy Frosting:
- ½ cup unsalted butter
- ⅓ cup milk
- ¼ cup unsweetened cocoa powder
- 3 cups powdered sugar
- 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 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: In a separate bowl, beat the eggs, then add buttermilk, vegetable oil, and vanilla extract. Mix until smooth.
Step 4: Gradually add the wet ingredients to the dry ingredients, mixing just until combined. Carefully stir in the hot water—the batter will be thin, which is perfect for a moist cake.
Step 5: Pour the batter into your prepared pan and bake for 30-35 minutes, or until a toothpick inserted in the center comes out clean.
Step 6: While the cake bakes, prepare the frosting. In a medium saucepan, melt butter over medium heat. Whisk in milk and cocoa powder until smooth. Remove from heat and whisk in powdered sugar, vanilla, and salt until creamy.
Step 7: Once the cake is out of the oven, let it cool for about 10 minutes before spreading the warm frosting evenly over the top. The frosting will set as the cake cools completely.
Expert Tips for Perfect Results
Measure accurately: Use the spoon-and-level method for flour and cocoa powder to ensure proper texture.
Don’t overmix: Mix the batter just until combined—overmixing can make the cake tough.
Hot water is key: The hot water helps bloom the cocoa powder for maximum chocolate flavor.
Frost while warm: Spreading the frosting on a warm cake allows it to soak in slightly, creating that signature fudgy texture.
If you love this simple dessert, you might also enjoy our Moist And Fudgy Chocolate Cake for special occasions or our Easy Chocolate Traybake Recipe for even more chocolate goodness.
Frequently Asked Questions
Can I make this cake ahead of time?
Absolutely! This cake actually tastes better the next day as the flavors develop. Store it covered at room temperature.
Can I use a different pan size?
Yes, you can use a 10×15-inch jelly roll pan for a thinner cake—reduce baking time to 20-25 minutes.
What if I don’t have buttermilk?
Make your own by adding 1 tablespoon of vinegar or lemon juice to 1 cup of milk. Let it sit for 5 minutes before using.
How should I store leftovers?
Store covered at room temperature for up to 3 days, or refrigerate for up to a week. For more chocolate inspiration, check out our Dark Chocolate Sheet Cake variation.
This easy chocolate sheet cake is truly the ultimate family-friendly dessert that never fails to impress. With its simple preparation and incredible results, it’s sure to become your go-to recipe for any occasion!

Easy Chocolate Sheet Cake with Fudgy Frosting: The Perfect One-Pan Dessert
Ingredients
Method
- Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking pan and set aside.
- In a large mixing bowl, whisk together flour, sugar, cocoa powder, baking soda, baking powder, and salt until well combined.
- In a separate bowl, beat the eggs, then add buttermilk, vegetable oil, and vanilla extract. Mix until smooth.
- Gradually add the wet ingredients to the dry ingredients, mixing just until combined. Carefully stir in the hot water—the batter will be thin, which is perfect for a moist cake.
- Pour the batter into your prepared pan and bake for 30-35 minutes, or until a toothpick inserted in the center comes out clean.
- While the cake bakes, prepare the frosting. In a medium saucepan, melt butter over medium heat. Whisk in milk and cocoa powder until smooth. Remove from heat and whisk in powdered sugar, vanilla, and salt until creamy.
- Once the cake is out of the oven, let it cool for about 10 minutes before spreading the warm frosting evenly over the top. The frosting will set as the cake cools completely.



