Texas Chocolate "Quarter" Sheet Cake

Ingredients

For the cake:

• 1 cup all-purpose flour
• 1 cup granulated sugar
• 1/8 teaspoon salt
• 1 stick (4 ounces) unsalted butter
• 2 heaping tablespoons unsweetened cocoa powder
• 1/2 cup boiling water
• 1/4 cup buttermilk
• 1 large egg, beaten
• 1/2 teaspoon baking soda
• 1/2 teaspoon vanilla

For the frosting:

• 7 tablespoons unsalted butter
• 2 heaping tablespoons cocoa powder
• 3 tablespoons buttermilk
• 1 teaspoon vanilla
• 2 heaping cups powdered sugar

Instructions

1. Preheat the oven to 350.
2. Lightly spray a quarter-sheet pan with cooking spray. A quarter-sheet pan measures 12x10-inches.
3. First, make the cake. In a medium bowl, whisk together the flour, sugar, and salt.
4. In a small saucepan over medium-low heat, melt the butter.
5. Once melted, stir in the cocoa powder and boiling water.
6. In a measuring cup, stir together the buttermilk, egg, baking soda and vanilla.
7. Add the buttermilk mixture to the flour mixture, following by the boiling water mixture.
8. Stir together all cake ingredients very ell, and then pour into the prepared pan.
9. Bake cake for 15-18 minutes, or until a toothpick inserted comes out clean.
10. While the cake bakes, make the frosting. In the same saucepan, melt the butter over medium-low heat.
11. Stir in the cocoa powder, buttermilk and vanilla until well-combined.
12. Remove the pan from heat and whisk in the powdered sugar.
13. Immediately when the cake comes out of the oven, pour the frosting over. Use an off-set spatula to spread the frosting to the edges of the pan.
14. Let the cake cool for at least 30 minutes before serving.

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