1/4  pound butter                
1 cup peanut butter                
12 ounce package milk chocolate chips

1 large box Crispix cereal
1 pound box powdered sugar

Melt margarine, peanut butter and chocolate chips in a microwave on medium setting 2 minutes or longer until melted. 
Stir to blend.  

Place Crispix cereal in a large pan and pour chocolate mixture over top.  Stir to coat.
Place powdered sugar in a grocery bag.

Put coated cereal in the bag and shake until powdered sugar is absorbed. 
Open bag and let it cool.  Store in tins.