Heat over to 350 degrees. Pam spray a 13 x 9 x 2 inch pan with nonstick cooking spray. Combine egg, oil and buttermilk in a small bowl. In a large bowl, whisk together the flour, sugar, cocoa, baking soda and salt. Beat egg mixture into dry ingredients; continue beating until well blended. Slowly stir in the coffee. Place mixture into prepared pan. Bake at 350 degrees for 30 to 35 minutes or until toothpick inserted in center comes out clean. Cool on wire rack. For frosting, mix sugar and milk in heavy saucepan until sugar is dissolved. Add butter and bring to a boil. Remove from heat. Place chocolate chips in a bowl; pour hot mixture on top.
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