Texas Sheet Cake

CAKE

2 sticks butter

1 cup water

1/4 cup plus 2 tablespoons cocoa powder, divided

2 cups all-purpose flour

2 cups granulated sugar

2 eggs

1/2 cup sour cream

1 teaspoon baking soda

1/2 teaspoon salt

FROSTING

1/4 cup (1/2 stick) butter

3 tablespoons milk

1 (16-ounce) box confectioners' sugar

1/2 teaspoon vanilla extract

What To Do:

1. Preheat oven to 350 degrees F.
    
2. In a small saucepan, combine 2 sticks butter, water, and 1/4 cup cocoa powder; cook over low heat until butter is melted, stirring occasionally. Remove from heat and pour into a large heat-resistant bowl to cool. Add flour, granulated sugar, eggs, sour cream, baking soda and salt; beat until well combined then pour into a 10- x 15-inch rimmed baking sheet.
    
3. Bake 25 minutes, or until a knife inserted in center comes out clean; set aside to cool.
    
4. In a small saucepan, make frosting by melting the 1/4 cup butter with milk and the remaining cocoa powder over low heat. Remove from heat and stir in confectioners’ sugar and vanilla; mix well then frost cooled cake.

*I make this in a cookie sheet and I do not double the cake, just the frosting*

FROM: http://www.mrfood.com/Cakes/Texas-Sheet-Cake-from-Mr-Food