inches. Heat marshmallows and margarine in 3-quart saucepan over low heat, stirring constantly, until marshmallows are melted and mixture is smooth; remove from heat. Stir in vanilla. Stir in half of the cereal at a time until evenly coated. Press in pan; cool. Cut into about 2 X 1-inch bars. 36 Bars; 35 Calories Per Bar. To Microwave: Cut margarine into 4 pieces. Place on marshmallows in 3-quart microwavable bowl or casserole. Microwave uncovered on high 1 minute 30 seconds to 2 minutes 30 seconds, stirring every minute, until marshmallows can be stirred smooth. Continue as directed.