Grease a large round bowl and pour the cereal in. Set aside.
Grease a 9x13 inch pan. Set aside.
In a pan on the stove, combine the corn syrup and sugar. Stir over medium/high heat until it comes to a boil.
Immediately remove from heat and stir in 1 1/2 cups of peanut butter. Immediately pour this mixture over the cereal and fold in. Pour into the 9x13 pan.
In a microwaveable 4 cup measuring cup (or other microwave-safe dishes) combine the butterscotch chips and chocolate chips. Microwave for 30 seconds at a time, stirring very well after each interval, until it is completely melted and smooth. It should take about 1 minute and 30 seconds.
Pour over the bars. Allow to cool completely at room temperature before cutting.
