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Easy Chocolate Sheet Cake with Fudgy Chocolate Frosting

This easy chocolate sheet cake recipe is the ultimate solution for anyone craving a delicious, crowd-pleasing dessert that's simple to make and perfect for sharing. With a moist one-pan chocolate cake base and rich cocoa frosting, it's ideal for parties, potlucks, or family-friendly weeknight treats.
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Prep Time 20 minutes
Cook Time 30 minutes
Total Time 50 minutes
Servings: 12 servings
Calories: 450
Ingredients Method Notes

Ingredients
  

Ingredients
  • 2 cups all-purpose flour
  • 2 cups granulated sugar
  • 1 cup unsalted butter
  • 1 cup water
  • 4 tablespoons cocoa powder
  • 1 teaspoon baking soda
  • 1/2 cup buttermilk
  • 2 large eggs
  • 1 teaspoon vanilla extract
  • 1/2 cup unsalted butter
  • 4 tablespoons cocoa powder
  • 6 tablespoons milk
  • 1 teaspoon vanilla extract
  • 3 1/2 cups powdered sugar
  • 1 cup chopped walnuts or pecans (optional)

Method
 

Instructions
  1. Preheat oven to 350°F (175°C). Grease a 9x13 inch baking pan. In a large mixing bowl, combine flour and sugar.
  2. In a saucepan, melt butter with water and cocoa powder over medium heat, stirring constantly until smooth. Bring to a boil, then remove from heat.
  3. Pour the hot chocolate mixture over the flour and sugar. Mix well until combined. Add baking soda, buttermilk, eggs, and vanilla extract. Stir until smooth.
  4. Pour batter into prepared pan and bake for 25-30 minutes, or until a toothpick inserted in the center comes out clean.
  5. While the cake is baking, make the frosting. Melt butter with cocoa powder and milk in a saucepan. Bring to a boil, then remove from heat. Stir in vanilla extract and gradually add powdered sugar until smooth. Stir in nuts if using.
  6. Pour the warm frosting over the hot cake as soon as it comes out of the oven. Spread evenly and let cool completely before serving.

Notes

For extra moist cake, don't overmix the batter after adding the wet ingredients. Make sure the frosting is poured over the hot cake so it soaks in slightly. For a richer flavor, use high-quality cocoa powder. The cake freezes well - perfect for make-ahead parties.