Rice Krispies Peanut-Butterscotch Bars

1 cup butterscotch chips
1/2 cup smooth peanut butter
3 cups Rice Krispies cereal

In a 3-quart saucepan, combine butterscotch chips and peanut butter. Cook over low heat, stirring constantly, until smooth. Remove from heat. Stir in cereal, mixing until well coated. Press mixture evenly into 9-inch square pan coated with cooking spray. Chill until firm. Cut into bars to serve. Store in airtight container in refrigerator.