Place semi sweet chocolate chips and marshmallows in freezer to harden
Combine white chocolate chips and peanut butter In a double boiler over medium heat, stir to melt chocolate and peanut butter. This can also be done in the microwave but do it slowly as the chocolate can burn easily.
Allow melted chocolate to cool for about 5 minutes.
Add in Rice Krispie cereal to chocolate and let mixture come to room temperature.
Fold in the chilled marshmallows and chocolate chips. Do not over mix or the chips may melt.
Pour the mixture onto a greased or parchment lined 9 x 13 baking sheet
Smooth out the top using a second sheet of wax paper.
Place in the refrigerator for 20-30 minutes or until harden.