2 c. semi-sweet chocolate chips
1 c. crunchy peanut butter
1 1/2 c. graham cracker crumbs
1 c. butter, melted
3/4 lb. powdered sugar

Melt chocolate in microwave or double boiler. Mix together remaining ingredients and pat into bottom of 9 x 13 pan. Spread melted chocolate over this mixture. Chill and cut into small squares.