In a medium sauce pan or nonstick dutch oven, melt the butter on medium heat. Add the corn syrup and sugar. (Until sugar dissolves) Heat and stir, bring to a boil and cook for 2-3 minutes.
In a microwave-safe bowl, add the chocolate chips and butterscotch chips. Cook for 1 minute. Stir, repeat as needed until chips are melted. Pour onto the rice crispies.