1Heat oven to 350°F (325°F for dark or nonstick pan). Grease bottom only of 8- or 9-inch square pan with shortening or cooking spray. In medium bowl, stir brownie mix, pouch of chocolate syrup, beer, oil and egg until well blended. Spread batter in pan.
2Bake 8-inch pan 38 to 40 minutes, 9-inch pan 34 to 37 minutes, or until toothpick inserted 2 inches from side of pan comes out almost clean. Cool completely in pan on cooling rack, about 1 hour 30 minutes.
3Spread frosting evenly over brownies. Refrigerate about 30 minutes or until firm. Cut into 4 rows by 4 rows.