Measure corn syrup and sugar into a large saucepan. Cook over medium heat, stirring frequently, until sugar dissolves and the mixture begins t boil. Remove from heat; stir in the peanut butter. Mix well. Add the rice krispies and stir until well coated. Press the mixture into a 9x13x2-inch pan that has been coated with non-stick vegetable cooking spray. Melt the chocolate and butterscotch chips together in a small saucepan over low heat, stirring constantly. Spread this mixture evenly over the cereal mixture. Let stand until firm. Cut into 1x2-inch bars to serve.
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