In large microwaveable bowl, mix syrup, peanut butter and sugar. Microwave at HIGH 1 1/2 - 2 minutes or until mixture comes to a boil, stirring halfway through. Add 1/2 cup of the chocolate chips and stir until melted and thoroughly blended.
Stir in cereal and peanuts, mixing well. Press firmly and evenly into 8" square pan.
In small microwaveable measure, microwave remaining chocolate chips at MEDIUM about 2 minutes or until partially melted; stir until smooth. Spread over cereal mixture. Chill until set, 30-40 minutes. Cut into bars.
Variation: Tiger-Striped Bars--Melt 1/4 cup butterscotch chips with 1 tsp vegetable oil and drizzle in stripes over chocolate before chilling bars.