1 cup sugar
6 tablespoons all-purpose flour
1/2 teaspoon salt
2 cups milk
3 egg yolks, beaten
1 teaspoon vanilla extract
2 tablespoons peanut butter 
1 square (1 oz.) semisweet chocolate, melted
1 graham cracker crust (9 inches), baked
Whipped cream

In the top of a double boiler, over hot but not boiling water, combine sugar, flour and salt.  Gradually add milk and cook for 10 minutes, stirring constantly.  Pour a small amount of the hot milk mixture into the egg yolks; return all to double boiler.  Cook for 4 minutes, stirring constantly.  Remove from the heat; stir in vanilla.  Cool for about 10 minutes.  Divide mixture in half.  To one portion, stir in peanut butter; mix well.  To the remiaining portion, stir in melted chocolate.  Allow mixtures to cool completely.  Fill pie crust with peanut butter mixture, then chocolate mixture.  Chill for 2-3 horus.  Just before serving, top with whipped cream.  Store leftovers in the refrigerator.