In a large saucepan, combine the corn syrup and sugar over medium heat.
Stir constantly until the sugar dissolves and the mixture just begins to bubble.
Remove the pan from the heat and stir in the peanut butter until smooth.
Pour in the Rice Krispies and stir gently until the cereal is fully coated.
Transfer the mixture into your prepared pan and press it down evenly.
In a microwave-safe bowl, combine the chocolate chips and butterscotch chips.
Heat in 30-second bursts, stirring between each, until smooth and melted.
Pour the melted chocolate-butterscotch mixture over the cereal layer, spreading it evenly with a spatula.
Let the bars sit at room temperature until the topping sets, about 1–2 hours.
Once the topping is firm, cut into squares or rectangles. Serve and watch them disappear.
