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Ultimate Indulgent Chocolate Sheet Cake with Fudgy Frosting

This indulgent chocolate sheet cake is perfect for feeding a crowd with its moist, rich chocolate base and velvety fudgy icing. Using simple ingredients and one bowl, this easy recipe delivers bakery-quality results for potlucks, celebrations, or chocolate cravings.
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Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings: 15 servings
Calories: 420
Ingredients Method Notes

Ingredients
  

Ingredients
  • 2 cups all-purpose flour
  • 2 cups granulated sugar
  • ¾ cup unsweetened cocoa powder
  • 2 teaspoons baking soda
  • 1 teaspoon baking powder
  • 1 teaspoon salt
  • 1 cup vegetable oil
  • 1 cup buttermilk
  • 2 large eggs
  • 1 cup strong brewed coffee, cooled
  • 1 tablespoon vanilla extract
  • ½ cup butter
  • ¼ cup cocoa powder
  • 6 tablespoons milk
  • 1 teaspoon vanilla extract
  • 3½ cups powdered sugar

Method
 

Instructions
  1. Preheat your oven to 350°F (175°C). Grease a 9x13-inch baking sheet with butter or cooking spray.
  2. In a large mixing bowl, whisk together flour, sugar, cocoa powder, baking soda, baking powder, and salt until well combined.
  3. Add vegetable oil, buttermilk, eggs, cooled coffee, and vanilla extract to the dry ingredients. Mix until just combined – be careful not to overmix the batter.
  4. 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.
  5. While the cake bakes, prepare the fudgy icing. In a medium saucepan, melt butter over medium heat. Whisk in cocoa powder until smooth.
  6. Remove from heat and stir in milk and vanilla extract. Gradually whisk in powdered sugar until the icing is smooth and glossy.
  7. Pour the warm icing over the hot cake as soon as it comes out of the oven. Use a spatula to spread it evenly across the surface.
  8. Allow the cake to cool completely before slicing and serving.

Notes

For an extra-moist cake, use full-fat buttermilk and don't overbake. The coffee enhances chocolate flavor without making it taste like coffee (can substitute with hot water). Cake tastes better the next day as flavors meld together. Top with chocolate shavings or sprinkles before icing sets for special occasions.