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One-Pot Chocolate Sheet Cake

  • Author: Joy the Baker
  • Prep Time: 15 minutes
  • Cook Time: 15-18 minutes
  • Total Time: 40 minutes or so



For the Cake:

  • 1/2 cup water
  • 8 tablespoons unsalted butter
  • 1/4 cup unsweetened cocoa powder
  • 1/4 cup buttermilk
  • 1 large egg
  • 1 teaspoon pure vanilla extract
  • 1 cup all-purpose flour
  • 1 cup granulated sugar
  • 1/2 teaspoon baking soda
  • 1/2 teaspoon salt

For the Topping:

  • 1 1/2 cups heavy cream
  • 1/4 cup powdered sugar
  • 1/2 teaspoon pure vanilla extract
  • 2 tablespoons unsweetened cocoa powder
  • 1/4 cup strawberry milk powder or powdered dehydrates strawberries


  1. To make the cake, bring the water to a boil in a medium saucepan. Add the butter to the water and stir in the cocoa powder until smooth. Remove from the heat and cool slightly. Add the buttermilk, eggs, and vanilla extract; stir until well combined.
  2. Add the flour, sugar, soda, and salt and whisk until smooth.
  3. Place a rack in the center of the oven; preheat oven to 350 °F. Spray a 9×13-inch sheet pan (a quarter-sheet pan) with nonstick cooking spray and line with parchment paper. Pour the batter into the pan and bake for 15 minutes. Allow to cool before frosting.
  4. To make the frosting, lightly whip the cream and sugar to soft peaks. Divide the cream into three bowls and mix each whipped topping with a separate flavor : vanilla extract, cocoa powder, and strawberry. Spread generously in thirds across the cooled cake.


  • Serving Size: 8-12