Cinnamon Mocha Cupcakes

In a small mixing bowl, cream the butter and sugar. Beat in egg and vanilla. Combine the flour, cocoa, baking soda, salt, baking powder and cinnamon; add to creamed mixture alternately with coffee and buttermilk. Coat muffin cups with nonstick cooking spray or use paper liners; fill half full with batter. Bake at 350 degrees F for 18-20 minutes or until a toothpick comes out clean. Cool for 5 minutes before removing from pan to a wire rack to cool completely. Place the frosting in a bowl. Dissolve coffee granules in hot water; stir into frosting until smooth. Frost cupcakes.