Peanut Butter Rice Crispy Bars 

1/4 cup butter or margarine 
1 package (10oz) marshmallows 
6 cups chocolate flavored crispy rice cereal 
1 cup peanut butter chips 
1/2 cup chopped peanuts, optional 

Grease a 13X9 inch pan. In a large pan over low heat, melt the marshmallows and butter, stirring. Remove from heat and stir in remaining ingredients; mix well. Press mixture into the pan, cool, and cut into 36 bars.