Step 1

Heat oven to 350°F (325°F for dark or nonstick pan). Grease bottom of 9-inch square pan with shortening or cooking spray.

Step 2

Make and bake brownies as directed on box for cakelike brownies. Cool completely on cooling rack, about 1 1/2 hours.

Step 3

In medium bowl, stir together frosting, marshmallow creme, mint extract and food color until well blended. Spread over cooled brownies. Sprinkle with cookies; press in slightly. Cut into 4 rows by 4 rows.