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Top view of a frosted buttermilk sheet cake with a slice being served from the corner.

Buttermilk Sheet Cake

5 Stars 4 Stars 3 Stars 2 Stars 1 Star 4.6 from 10 reviews
  • Author: Shelly
  • Prep Time: 5 minutes
  • Cook Time: 18 minutes
  • Total Time: 23 minutes
  • Yield: serves 12 1x
  • Category: Dessert
  • Method: Oven
  • Cuisine: American


This tender and buttery Buttermilk Sheet Cake is topped with creamy vanilla frosting that literally melts into the cake! A perfect easy dessert idea for parties!



For the Buttermilk Cake

  • 2 cups granulated sugar
  • 2 cups all purpose flour
  • 1/2 teaspoon baking soda
  • 1/2 teaspoon kosher salt
  • 1 cup butter, melted
  • 1 cup boiling water
  • 2 eggs, lightly beaten
  • 2 teaspoons vanilla
  • 1/2 cup buttermilk

For the Frosting

  • 1/2 cup butter, melted
  • 4 cups powdered sugar
  • 3 tablespoons milk
  • 1 teaspoon vanilla extract


  1. Preheat the oven to 400°F/200°C. Coat an 11×17 rimmed baking sheet with baking spray and set aside.
  2. In a large bowl whisk together the sugar, flour, baking soda, and salt. Whisk in the butter and water until combined. Next whisk in the eggs, vanilla, and buttermilk until smooth.
  3. Pour the batter into the prepared pan and bake for 15-18 minutes until a toothpick inserted in the center comes out clean.
  4. Place the cake on a wire rack to begin cooling and immediately make the frosting.
  5. In another large bowl whisk together the butter, powdered sugar, milk, and vanilla until no lumps remain. Pour immediately onto the warm cake.
  6. Allow the cake to cool before serving.

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