Chocolate Texas Sheet Cake

Directions

1. In a large saucepan, bring the butter, water and cocoa just to a boil. Immediately remove from the heat. Combine the flour, sugar, baking soda and salt; stir into butter mixture. Combine the eggs and sour cream; stir into butter mixture until blended.
2. Pour into a greased 15x10x1-in. baking pan. Bake at 350° for 18-25 minutes or until a toothpick inserted in the center comes out clean. Cool on a wire rack.
3. For frosting, in a large bowl, cream the butter and confectioners' sugar. Add cocoa, vanilla and enough milk to achieve desired consistency. Spread over cake.