Grease an 8x8" square baking pan.
In a medium saucepan, stir the condensed milk
over medium heat until barely simmering.
Remove from heat; add chips, chocolate and salt.
Let sit until the chocolate is nearly melted,
about 3 minutes. Stir until smooth.
Stir in the vanilla. Scrape the mixture into
prepared pan and smooth the top.
Refrigerate the fudge for at least 1 hour to set.
Cut into 1 inch squares.
Serve or wrap for gifts.