1/4 c. butter
1/2 tsp. vanilla
1 (6 oz. to 10 oz.) pkg. marshmallows
5 c. Rice Krispies cereal

Melt butter in 3 quart saucepan. Add marshmallows and cook over low heat, stirring constantly until marshmallows are melted and mixture is very syrupy. Remove from heat and stir in vanilla. Add Rice Krispies and stir until well coated. Press warm mixture into a 13 x 9 x 2 pan. Cut into squares when cool. Crushed cornflakes can be used instead of Rice Krispies.