Email to Cat Rice Krispies Bars Source of Recipe Kids In The Kitchen List of Ingredients 1/4 cup margarine 4 cups miniature marshmallows 1/2 tsp vanilla 5 cups Rice Krispies cereal Instructions Heat margarine and marshmallows in a saucepan until thick and syrupy. Add vanilla. Pour over cereal. Press mixture into a greased pan. When cool, cut into bars.