1. Coat 13x9x2-inch microwave-safe dish with vegetable cooking spray. Place 6 whole pieces graham crackers in single layer in bottom. Cut remaining piece to fit in remainder of bottom. Sprinkle marshmallows evenly over crackers.
2. Microwave on HIGH one minute or until marshmallows are puffy. Remove from microwave and cool completely.
3. In 2-quart microwave-safe mixing bowl, combine chocolate morsels, corn syrup, and margarine. Microwave in HIGH about 1 ½ minutes or until chocolate can be stirred smooth. Stir in peanut butter. Add Rice Krispies cereal, mixing until evenly combined. Spread evenly over marshmallows. Cover and refrigerate about 1 hour or until firm. Cut and store in airtight container in refrigerator. Yields 36 squares.
(For conventional method directions……Do step 3 in 2-quart pan on stove.)