Last Updated on 2021-01-09 by Audie Casiguran
Combine butter, chocolate chips and butterscotch chips in 4-quart saucepan. Cook over low heat, stirring constantly, until melted (4 to 6 minutes). Stir in peanut butter until well mixed.
Remove from heat. Add cereal and marshmallows; toss until well coated.
Press mixture onto bottom of buttered 13×9-inch baking pan. Refrigerate until firm (about 30 minutes). Cut into bars. Store refrigerated.