Coat an angel food cake pan with cooking spray , set aside. Pop popcorn. & dump in a very large bowl. Removing unpoped kernels. Stir in peanuts & M & M's. Set aside.

In a large bowl , melt butter in the microwave. Stir in marshmallows and microwave until puffed. Stir until smooth and melted. Let set for 2 minutes. Pour marshmallow mixture over popcorn mixture & stir to coat evenly. Press mixture into prepared pan. Cover & let set 1 hour.

Run a knife between popcorn and the pan. To loosen cake.Place on serving plate. Invert pan to remove . Before cutting.