1 - 19.8 or 21 ounce package brownie mix
1/2 cup toffee pieces
2 to 3 tablespoons instant espresso powder or instant coffee crystals
3/4 cup canned vanilla frosting
1 tablespoon Irish cream liqueur or coffee liqueur
1/4 cup toffee pieces
Preheat oven to 350F. Line a 9x9x2 baking pan with foil, extending the foil over the edges of the pan. Grease foil; set aside. Prepare brownie mix according to package directions. Stir in the 1/2 cup toffee pieces and the espresso powder. Spread batter in prepared pan.
Bake for 35 minutes. Cool in pan on a wire rack. use the foil to lift brownies from pan. In a small bowl stir together vanilla frosting and liqueur. Spread frosting mixture over cooled brownies. Sprinkle with the 1/4 cup toffee pieces. Cut into squares.