Butter a 9x13 bake dish. In a large pot melt butter and corn syrup/agave over medium heat. Once melted mix in peanut butter and sugar. Slowly melt over medium high heat. Remove from heat and mix in rice cereal. Pour mixture into buttered bake dish. Press down firmly. Microwave chocolate chips and butterscotch chips for two minutes. No more. Mix well then pour over rice cereal. Set aside to cool. Refrigerate if necessary.