Melt margarine in large saucepan over low heat. Add marshmallows and stir until completely melted. Remove from heat. Stir in peanut butter, mixing until smooth. Add Rice Krispies. Stir until well coated. Using buttered spatula or waxed paper, press mixture into a 3-quart rectangular pan coated with cooking spray. Cut in 2-inch squares when cool. Microwave directions: In large microwave-safe bowl, microwave margarine and marshmallows at HIGH 1 minute longer. Stir until smooth. Add cereal. Stir until well coated. Press into pan as directed. Makes 24 squares. Recipe by: BETTER HOMES AND GARDENS MAGAZINE -- SEPTEMBER 1996 Posted to MC-Recipe Digest V1 #677 by essie49@juno.com (Ethel R Snyder) on Jul 17, 1997