Spray a 9"x13" pan with non-stick cooking spray. Set aside.
Heat granulated sugar and corn syrup in a large, heavy saucepan over medium heat, stirring continually, until mixture comes to a boil.
Remove from heat and stir in peanut butter.
Add Rice Krispies to a large bowl. Pour peanut butter mixture over the cereal and mix to combine.
Spread the Rice Krispies mixture evenly in the prepared baking pan. Set aside.
In the microwave, melt the chocolate and butterscotch chips in a large glass bowl. Heat for 1 minute and then stir. Then, heat in 30-second intervals, stirring in between, until the chips are completely melted.
Pour chocolate-butterscotch mixture over the cereal mixture in the baking pan and spread out evenly. Set aside for 2 hours or until chocolate hardens.
Slice into 18 sections before serving. Enjoy!
Notes
For a thicker chocolate-butterscotch topping, double the amount of chocolate chips and butterscotch chips.