In a large soup pot, melt butter, peanut butter and chocolate chips and add one and a half bags of the mini marshmallows.
Stir continuously until everything is melted- this is over medium heat- do not scorch it.
In a separate bowl, add the rice krispies. Pour the mixture over the cereal. Add the remaining marshmallows. Stir really fast with a wooden spoon. This is a HUGE are workout.
When combined, spread in a 9x13 inch pan, use the butter wrapper to pat down and flatten out. The butter wrapper is already greased, so you don't have to spray anything.
Let cool and cut into squares.