1.  Combine margarine and peanut butter.
2.  Stir until creamy.
3.  Mix in graham crackers.
4. 
                                             Stir in confectioners sugar.
5.  Press firmly into a 9" x 13" buttered pan. (or line pan with tinfoil or waxed paper)
6. 
                                             Top with melted chocolate.
7.  When totally cooled cut into 1 1/2" squares.