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Easy Indulgent Chocolate Sheet Cake Recipe - Crowd-Pleasing Party Dessert

This indulgent chocolate sheet cake is the perfect dessert for feeding a crowd with its rich, moist crumb and decadent fudgy icing. The recipe comes together easily in one bowl and bakes beautifully in a standard sheet pan, making it ideal for parties and gatherings.
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Prep Time 20 minutes
Cook Time 35 minutes
Total Time 55 minutes
Servings: 15 servings
Calories: 380
Ingredients Method Notes

Ingredients
  

Ingredients
  • 2 cups all-purpose flour
  • 2 cups granulated sugar
  • 1 cup unsalted butter, softened
  • 4 large eggs
  • 1 cup buttermilk
  • 3/4 cup cocoa powder
  • 1 teaspoon baking soda
  • 1/2 teaspoon salt
  • 1 teaspoon vanilla extract
  • 1 cup boiling water
  • 1/2 cup unsalted butter
  • 3 tablespoons cocoa powder
  • 6 tablespoons milk
  • 3 cups powdered sugar
  • 1 teaspoon vanilla extract
  • Pinch of salt

Method
 

Instructions
  1. Preheat your oven to 350°F (175°C). Grease and flour a 9x13-inch sheet pan or line it with parchment paper for easy removal.
  2. In a large mixing bowl, whisk together the flour, sugar, cocoa powder, baking soda, and salt. This ensures even distribution of all the leavening agents and flavor components.
  3. Add the softened butter, eggs, buttermilk, and vanilla extract to the dry ingredients. Mix on medium speed until just combined - be careful not to overmix, which can lead to a tough cake.
  4. Slowly pour in the boiling water while mixing on low speed. The batter will be thin - this is normal and contributes to the cake's incredible moisture.
  5. Pour the batter into your prepared sheet pan and bake for 30-35 minutes, or until a toothpick inserted in the center comes out clean. The cake should spring back when lightly touched.
  6. While the cake cools slightly, prepare the icing. Melt butter in a saucepan over medium heat. Whisk in cocoa powder and milk until smooth. Remove from heat and stir in powdered sugar, vanilla, and salt until you achieve a pourable consistency.
  7. Pour the warm icing over the slightly warm cake, spreading it evenly with a spatula. Allow the icing to set before cutting into generous squares and serving.

Notes

For extra moist cake: Don't skip the boiling water step - it helps bloom the cocoa powder. Room temperature ingredients ensure even mixing. Don't overmix to avoid dense cake. Apply icing to slightly warm cake for perfect setting.