Open the can of milk and empty into a medium saucepan. Put on Burner over low heat.
Add 3 cups, a cup at a time, taking care to stir the mixture over the heat. Keep stirring the saucepan mixture until the chocolate is smooth and the chips are all melted. Add salt with a measured hand. Add vanilla to the mixture and stir until it it is completely integrated.
Our the hot mixture into a wax paper lined baking dish (this is 9X9). In this photograph, it features mixture in which mint chocolate M&M's have been mixed in, in the pan.
Using your finger (or your spatula), smooth the top of the mixture, as you would brownie batter before your refrigerate. Put in the fridge and allow to set for 2-3 hours.
Remove the wax paper from the fridge and place on a cutting board. Slice into rows. You'll know the fudge has set if it slices easily.
Cut the opposite direction to make approximately uniform squares of fudge.
Decoration Suggestions: Add M&M candies to each square (before or after being cut) so there is a colorful decoration on each square. Serve and ENJOY! *Freezes well and makes an awesome gift!