Add a package of instant mocha cappuccino mix to butter and powdered sugar for a coffee-flavored buttercream frosting.
Dissolve instant mocha cappuccino mix in hot milk in a small cup, stirring to combine; cool completely. Pour milk mixture into a mixing bowl; add softened butter, and beat at medium speed with an electric mixer until well combined.
Gradually add powdered sugar, beating until smooth and fluffy.
Note: For testing purposes only, we used Land O'Lakes Suisse Mocha Hot Cappuccino Mix.
Used homemade esspresso mix from allrecipes and it was perfect on the cappuccino-frosted brownies.