Avalanche Bark from Rocky Mtn. Chocolate Factory - Clone

In double boiler (or metal bowl over a sauce pan filled
1/4 about full of water) over medium-high heat, add
white chocolate chips and peanut butter.
Constantly stir with wire wisk until completely melted.
Remove from heat (and remove off bottom boiling water).
Set aside and let cool for about 5 minutes
Transfer mixture to a mixing bowl.
Fold in all of the rice crispies.
Let cool till it barely feels warm (if you add the marshmallows and semi-sweet chocolate chips when it's too warm, they will melt and that's not what you want).
It will take a while to cool, but do not cool it down in the refridgerator or it will set up.
While you wait, line a 4"x8.5" loaf pan with plastic wrap.
You may even want to lightly spray the plastic with cooking spray first for easier removal.
When the mixture is cooled, fold in marshmallows first then the semi-sweet chips (just fold to distribute, don't over work the mixture).
Pour the mixture into the prepared pan, fold the excess plastic wrap over top and gently press the mixture so it's even in the pan.
The harder you press, the denser the bark will be.
Now it's time to put in the fridge to set it up.
It will take about 20 to 30 minutes to completely set up.
When set, remove from pan and cut into desired size pieces.