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Dark Chocolate Sheet Cake Recipe: Elegant Dessert for Sophisticated Tastes

This dark chocolate sheet cake offers a perfect balance of sophistication and simplicity with intense cocoa flavor and moist, tender crumb that appeals to grown-up palates. It's an elegant sheet pan dessert that's easy to make, serves generously, and always impresses at parties or potlucks.
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Prep Time 20 minutes
Cook Time 35 minutes
Total Time 1 hour 25 minutes
Servings: 12 servings
Calories: 420
Ingredients Method Notes

Ingredients
  

Ingredients
  • 2 cups all-purpose flour
  • 2 cups granulated sugar
  • 3/4 cup unsweetened dark cocoa powder
  • 2 teaspoons baking soda
  • 1 teaspoon baking powder
  • 1 teaspoon salt
  • 2 large eggs
  • 1 cup buttermilk
  • 1 cup warm water
  • 1/2 cup vegetable oil
  • 2 teaspoons vanilla extract
  • 1/2 cup unsalted butter
  • 1/3 cup milk
  • 3 tablespoons unsweetened cocoa powder
  • 4 cups powdered sugar
  • 1 teaspoon vanilla extract
  • Pinch of salt

Method
 

Instructions
  1. Preheat oven to 350°F (175°C). Grease a 9x13-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.
  2. In a separate bowl, beat eggs lightly, then add buttermilk, warm water, vegetable oil, and vanilla extract. Mix until smooth. Gradually add wet ingredients to dry ingredients, stirring until just combined.
  3. Pour batter into prepared pan and spread evenly. Bake for 30-35 minutes, or until a toothpick inserted in center comes out clean. Allow cake to cool completely in pan on wire rack before frosting.
  4. While cake cools, melt butter in medium saucepan over low heat. Stir in milk and cocoa powder, heating until smooth. Remove from heat and gradually whisk in powdered sugar until frosting is smooth and spreadable. Stir in vanilla extract and pinch of salt.
  5. Once cake is completely cool, pour warm frosting over top, spreading evenly with spatula. Allow frosting to set for at least 30 minutes before slicing and serving.

Notes

Use high-quality cocoa powder for richest chocolate flavor. Ensure ingredients are at room temperature for best mixing. Don't overmix the batter - stir just until combined. Cake tastes better the next day as flavors develop.