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In a large bowl, combine the flour, sugar, baking soda and salt; set aside. In a microwave-safe bowl, combine the chocolate and butter. Cover and microwave on high for 1 minute. Stir; cook 30 seconds longer or until melted.
In a small bowl, combine the buttermilk, oil and egg. Add to dry ingredients; beat just until combined. Add the chocolate mixture and vanilla.
Pour into a greased 8-in. square baking dish. Bake at 350? for 30-35 minutes or until a toothpick inserted near the center comes out clean. Cool completely on a wire rack.
For frosting, in a saucepan, combine the sugar, cornstarch, salt and chocolate; stir in the coffee until blended. Bring to a boil over medium heat; cook and stir until mixture is thickened. Remove from the heat; stir in the butter and vanilla. Spread warm frosting over cake.
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