1/4 c. butter
1 pkg. (10 oz. or 40) reg. marshmallows or 4 c. "mini" marshmallows
5 c. Rice Krispies

Melt butter in a large saucepan over low heat. Add marshmallows and stir until melted and well blended. Cook 2 minutes, stirring constantly. Remove from heat. Add Rice Krispies and stir until well coated. Press mixture evenly and firmly in a 13 x 9 x 2 inch buttered pan. Cut into squares when cool.