Combine chocolate, sweetened condensed milk and
vanilla. Cook in microwave on high for 2 to 4
minutes; stirring after each minute until
chocolate is melted and mixture is smooth. Cool to
room temperature, about 1 1/2 hours. Beat until
smooth. Fold in whipped cream. Pour into pastry
shell. Chill 4 hours or until set. Garnished as
desired. Refrigerate leftovers.