In a saucepan over medium heat, combine the corn syrup and sugar. Stir until the mixture comes to a boil and the sugar has dissolved. Remove from heat and stir in peanut butter until smooth.

In a large bowl, pour the peanut butter mixture over the Rice Krispies cereal. Stir until the cereal is evenly coated.

Press the mixture into a greased 9x13 inch baking dish.

In a microwave-safe bowl, melt the chocolate chips and butterscotch chips together in 30-second intervals until smooth.

Pour the melted chocolate mixture over the cooled Rice Krispies layer and spread evenly.

Let it cool completely before cutting into squares and serving.