1/4 c. butter
4 cups miniature marshmallows
1/2 tsp vanilla
5 cups Kellog's Rice Krispies
Melt butter in a 4 L saucepan. Add marshmallows, and cook over low heat ,stirring constantly, until marshmallows are melted and mixture is well-blended. Remove from heat, stir in vanilla.
Add Rice Krispies and stir until well-coated with marshmallow mixture.
Press marshmallow treats mixture lightly into buttered 13X9-inch pan. Cut into squares when cool.