Grease a 9x13-inch baking dish with nonstick cooking spray or butter and set aside.
Place 6 cups Rice Krispies cereal in a large mixing bowl.
In a medium saucepan over medium heat, combine 1 cup peanut butter, 1 cup granulated sugar, and 1 cup light corn syrup.
Stir constantly until the mixture comes to a gentle boil.
Immediately pour the hot peanut butter mixture over the Rice Krispies cereal and stir until the cereal is evenly coated.
Transfer the mixture to the prepared baking dish and gently press it into an even layer with a spatula. Avoid pressing too firmly so the bars stay chewy.
In a small saucepan over low heat, melt 1 cup chocolate chips and 1 cup butterscotch chips together, stirring constantly until smooth.
Pour the melted chocolate mixture evenly over the cereal layer and spread it into an even coating with a spatula.
Let the bars cool completely and allow the topping to set before cutting into 24 squares. Serve and enjoy!