Line a 8"x8" pan with parchment paper or aluminum foil.
In a medium saucepan heat the sweetened condensed milk and heavy cream together over MEDIUM-LOW heat.
Whisk slowly as it heats and heat until it is hot and is beginning to steam, but not boiling.
Remove pan from heat and add the chocolate chips and chopped chocolate. Allow chocolate to slowly melt, this takes about 10 minutes.
Return the pan to LOW heat and whisk vigorously until the mixture is thick and shiny.
Pour the chocolate mixture into the prepared pan, and smooth the surface with an offset spatula.
Loosely cover the pan and allow the chocolate to cool slowly, on the counter OVERNIGHT.
The next day, run a knife around the edge of the pan, and pull on the parchment or foil to remove the chocolate square.
Cut the chocolate into 1 1/4" cubes. Heat the knife between cuts by running the knife under hot water, then wipe dry between each cut.
Add a wooden stick, then wrap the cubes as desired.