No-bake Chocolate Peanut bars

• Makes about 24

  1 cup butter or margarine, melted
  2 cups graham cracker crumbs
  2 cups powdered sugar
  1 cup peanut butter, crunchy or smooth
  1-1/2 cups semisweet chocolate chips
  4 tablespoons peanut butter

  In a medium mixing bowl, stir together butter or margarine, graham cracker crumbs, powdered sugar and 1 cup peanut butter until well blended. Press into the bottom of an ungreased 9 x 13" baking pan.
  
  In the top of a double boiler over hot (not boiling) water, melt the chocolate chips with the 4 tablespoons peanut butter, stirring occasionally until smooth. Spread on top of the mixture in the baking pan.
  
  Refrigerate for about 1 hour before cutting into bars.