Melt one 6 oz package of butterscotch chips with 1/2 cup peanut butter over low heat. Stir in 4 cups of Rice Krispies. Press half of mix in a buttered 9×13 inch pan & chill. Set remaining ingredients aside. Stir over double boiler – 1 cup chocolate chip, 1/2 cup powdered sugar, 2 tbsp margarine, 1 tbsp water until chocolate melts. Spread over chilled mix. Top with reserved mix, chill & cut into squares.