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Delicious homemade Texas Sheet Cake with buttermilk, cut into squares

Texas Sheet Cake with Buttermilk

A classic Texas-sized chocolate sheet cake made with buttermilk for an incredibly moist, tender crumb. Topped with a glossy, pourable chocolate buttermilk frosting that sets into a fudgy glaze.
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Prep Time 20 minutes
Cook Time 25 minutes
Servings: 24 servings
Ingredients Method Notes

Ingredients
  

Cake
  • 2 cups all-purpose flour
  • 2 cups granulated sugar
  • 0.5 cup unsweetened cocoa powder
  • 1 tsp baking soda
  • 0.5 tsp salt
  • 1 cup unsalted butter melted
  • 1 cup buttermilk
  • 2 large eggs
  • 1 tsp vanilla extract
Frosting
  • 0.5 cup unsalted butter
  • 0.25 cup unsweetened cocoa powder
  • 0.5 cup buttermilk
  • 3 cups powdered sugar
  • 1 tsp vanilla extract
  • 1 pinch salt

Method
 

  1. Preheat oven to 350°F (175°C). Lightly grease a 13x18 inch rimmed baking sheet or line with parchment paper.
  2. Whisk together the flour, sugar, cocoa powder, baking soda, and salt in a large bowl.
  3. In a separate bowl, whisk together the melted butter, buttermilk, eggs, and vanilla extract.
  4. Pour the wet ingredients into the dry ingredients and mix on low speed until just combined. Do not overmix.
  5. Pour the batter evenly into the prepared baking sheet and bake for 20–25 minutes, until a toothpick inserted in the center comes out clean.
  6. Remove from the oven and allow the cake to cool slightly while you prepare the frosting.
  7. Melt the butter in a medium saucepan over medium heat. Remove from heat and stir in the cocoa powder until smooth.
  8. Whisk in the buttermilk and vanilla extract, then gradually add the powdered sugar and a pinch of salt, whisking until smooth and pourable.
  9. Pour the frosting over the slightly warm cake and spread evenly. Allow to set for a few minutes before slicing and serving.

Notes

Store covered at room temperature for up to 3 days or refrigerate for up to 5 days. The frosting is best poured while the cake is still slightly warm. Do not overmix the batter or the cake will be tough.