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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.
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Prep Time 20 minutes
Cook Time 30 minutes
Total Time 50 minutes
Servings: 20 servings
Calories: 320
Ingredients Method Notes

Ingredients
  

Ingredients
  • 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
  • ½ cup unsalted butter, softened
  • ⅔ cup unsweetened cocoa powder
  • 3 cups powdered sugar
  • ⅓ cup milk
  • 1 teaspoon vanilla extract
  • Pinch of salt

Method
 

Instructions
  1. Preheat your oven to 350°F (175°C). Grease a 9x13-inch baking sheet or jelly roll pan and set aside.
  2. In a large mixing bowl, whisk together the flour, sugar, cocoa powder, baking soda, baking powder, and salt until well combined.
  3. In a separate bowl, beat the eggs, then add the buttermilk, vegetable oil, and vanilla extract. Mix until smooth.
  4. Gradually add the wet ingredients to the dry ingredients, mixing on low speed until just combined. Be careful not to overmix.
  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.
  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.
  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.
  8. Gradually add the powdered sugar, alternating with the milk, and beat until smooth and spreadable. Stir in the vanilla extract and salt.
  9. Once the cake has completely cooled, spread the frosting evenly over the top. Cut into squares and serve.

Notes

Use high-quality dark cocoa powder for richest flavor. Don't skip the hot water—it helps bloom the cocoa powder. Make sure cake is completely cool before frosting. Cake tastes better the next day as flavors develop.