In a medium sauce pan, bring sugar, peanut butter, and corn syrup to a boil, making sure to stir constantly.
As soon as the mixture starts to boil, pour over the cereal and mix well to coat. Pour into a greased 9-x-13-inch pan and gently press down lightly with a spatula to spread evenly into the pan.
In a small pan, melt chocolate and butterscotch chips together over low heat, stirring constantly. Pour over pressed Rice Krispies and spread evenly. Allow to set for at least 30 minutes before cutting and serving. Serves 15.