Microwave 2 oz. chocolate and butter in medium microwaveable bowl on HIGH 1-1/2 min. or until butter is melted. Stir until chocolate is completely melted and mixture is well blended. Add 1/2 cup sugar and 1/4 cup flavoured instant coffee; mix well. Blend in 1 egg. Stir in flour; spread onto bottom of 8-inch square pan sprayed with cooking spray.