Grease a 13x9 pan with butter.

In a microwave safe bowl, combine marshmallows and butter.

Heat until puffed and butter is melted stirring every 20 seconds.

Add the cereal and stir to coat.

Press mixture into pan and allow to cool.

Beat softened cream cheese, condensed milk and vanilla.

Pour on top of the cooled treats and chill a few hours.

Top with cherry pie filling and refrigerate.