Peanut Butter Cup Treats

1 cup butter or margarine

1 cup creamy peanut butter

3 ½ to 4 cups powdered sugar

1 package graham crackers, crushed

2 cups chocolate chips

Cream together butter or margarine and peanut butter.  Add powdered sugar and cream well.  Add crushed graham crackers to mixture and mix well.  Press into a 9x13 pan.  Melt chocolate chips and spread over top of mixture.  Refrigerate until chocolate is firm.  Cut or chip into bite-sized pieces.