In small microwavable bowl, microwave chocolate and peanut butter uncovered on High 1 minute 30 seconds to 2 minutes, stirring every 30 seconds, until softened and chocolate can be stirred smooth. Drizzle chocolate mixture over cereal mixture. Sprinkle with peanut butter cup candies. Let stand 30 minutes until chocolate is set. Cut into 6 rows by 4 rows.