Combine corn syrup, peanut butter, and sugar in a medium saucepan. Heat on medium heat, stirring, until melted and smooth. You do NOT need to bring the mixture to a simmer. It just needs to be warm, smooth, and easily pourable. Pour mixture over cereal in a large bowl. Stir to coat evenly. Using a medium cookie scoop (2 Tbsp. size), scoop clusters and place on parchment paper or wax paper lined baking sheets. Allow clusters to cool. Melt chocolate chips and butterscotch chips in a double boiler or microwave. I usually use my microwave and heat the chocolate chips and butterscotch chips for 30 seconds, then I stir and heat them for an additional 15-20 seconds. Every microwave is different, my advice is to go low and slow. Short intervals, stirring until smooth and creamy. DO NOT OVERHEAT CHOCOLATE. Spoon chocolate mixture over clusters. Allow the clusters to stand at room temperature until the chocolate hardens.