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Ultimate Easy Chocolate Sheet Cake Recipe - Rich, Moist & Crowd-Pleasing

This is an indulgent chocolate sheet cake that's easy to make with minimal effort, delivering rich moist chocolate flavor with decadent fudgy icing perfect for parties and gatherings. Combining convenience with exceptional taste, this one-bowl wonder serves 20-24 people and features practical storage solutions for busy hosts.
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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
  • 2 cups granulated sugar
  • 1 cup unsalted butter, softened
  • 1 cup water
  • ⅓ cup cocoa powder (unsweetened)
  • ½ cup buttermilk
  • 2 large eggs
  • 1 teaspoon baking soda
  • 1 teaspoon vanilla extract
  • ½ teaspoon salt
  • ½ cup unsalted butter
  • ⅓ cup cocoa powder
  • ⅓ cup milk
  • 3 cups powdered sugar
  • 1 teaspoon vanilla extract
  • ½ cup chopped walnuts or pecans (optional)

Method
 

Instructions
  1. Preheat your oven to 350°F (175°C). Grease a 9x13 inch baking pan with butter or cooking spray, then line with parchment paper for easy removal.
  2. In a large mixing bowl, whisk together the flour, sugar, baking soda, and salt.
  3. In a saucepan, combine 1 cup butter, 1 cup water, and ⅓ cup cocoa powder. Heat over medium heat until the butter melts and mixture comes to a gentle boil. Remove from heat and pour over the dry ingredients.
  4. In a separate small bowl, whisk together buttermilk, eggs, and vanilla extract. Add this mixture to the chocolate base and stir until just combined.
  5. Pour the batter into your prepared pan and bake for 25-30 minutes, or until a toothpick inserted in the center comes out clean.
  6. While the cake bakes, prepare the fudgy icing by combining ½ cup butter, ⅓ cup cocoa powder, and ⅓ cup milk in a saucepan. Bring to a boil, then remove from heat. Whisk in powdered sugar and vanilla until smooth. Stir in nuts if using.
  7. Once the cake is done baking, pour the warm icing over the hot cake. Spread evenly with a spatula.

Notes

Use high-quality cocoa powder for richest flavor. Mix batter until just combined - a few lumps are okay. Let cake cool completely before cutting. Cake tastes better the next day as flavors meld.