combine the milk, sugar chocolate and salt in a heavy saucepan, and heat over medium -low heat.  Stir off and on until the chocolate melts. Do not let it boil.

mix together the cornstarch and cream.

Slowly stir the cornstarch mix into the hot milk.  Stir constantly over medium heat until it just comes to a simmer; don't boil. Reduce heat and continue to stir for another minute or two until it thickens.

Remove from the heat and stir in the vanilla.

To prevent a thick skin from forming on top as it cools, cover it with plastic wrap pushing the wrap to touch the surface of the pudding.  It can be poured into individual serving dishes, or into one large dish.