Heat corn syrup and sugar in a medium saucepan. As soon as the mixture comes to a simmer, remove from heat and whisk in the peanut butter until smooth.
(This can also be done in the microwave using a microwave safe bowl in 20 - 30 second increments, stirring in-between, until sugar is fully dissolved into corn syrup).
Pour the peanut butter and sugar mixture into the Rice Krispies and mix well. Work quickly, it stiffens as it cools.
Press the cereal mixture into a parchment lined 9x13 inch casserole dish.
Melt the milk chocolate chips and the butterscotch chips together with a double boiler, or in the microwave in 20 - 30 second increments, stirring each time, until completely melted.
Spread the melted chocolate over the cereal mixture.
Let set & cool completely before removing from pan and cutting.
Notes
Calories are automatically generated. For best results calculate based on your exact ingredients.NOTE: I find chilling in the fridge for an hour before slicing is perfect.