In a large sauce pan, melt butter over medium heat. Add marshmallows and stir until melted. Add the peanut butter halfway through the melting process and stir until smooth.
Fold the marshmallow mixture into the cereal, then fold in mini marshmallows, chopped Snickers, and chopped peanuts.
Press the mixture into the prepared pan.
Over a double boiler, melt peanut butter chips, chocolate chips, butter, and half & half until smooth. Drizzle over the Krispie treats.
Allow the treats to set before cutting into squares.
Recipe by The Messy Baker Blog at http://themessybakerblog.com/2012/10/10/peanut-butter-snickers-rice-krispie-treats/