Texas Chocolate Sheet Cake
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Melt butter in small sauce pan. Add cocoa powder and water.
Whisk flour, sugar, baking soda and salt.
Add buttermilk, vanilla and egg to dry ingredients.
Pour melted butter mixture into bowl, and whisk until smooth.
Bake batter in quarter sheet pan at 350 degrees F for 15 minutes.
While cake bakes, make frosting by melting together butter, cocoa powder, buttermilk and powdered sugar.
Pour warm frosting on warm cake, slice into 12 pieces and serve.