Rice Crispy Treats

~I know most people know this one but thought I would post it anyway.

3 Tbls butter
1 pkg (10 0z) regualar marshmellows or 4 C's miniature marshmellows
6 C rice crispy treats

Melt butter in large saucepan over low heat. add marshmellows & stir until completley melted. Remove from heat. Add rice crispys, stir til well coated. Spread on waxed paper in baking pan. Press mixture evenly into pan coated with cookin spray. Cut into 2 in squares when cool.