1/4 c. butter
1/2 pound marshmallows (about 30 large marshmallows)
1/2 tsp. vanilla
5 c. Rice Krispies
Cook butter and marshmallows over low heat until just barely melted, and thick and syrupy (do not over cook or marshmallows will become hard when cool). Remove from heat. Add vanilla; beat thoroughly.
Put Rice Krispies in greased, large bowl and add marshmallow mixture. Mix well. Press mixture into 9x13" greased pan. Cut into squares when cool.
Makes 24 squares.