01 -
Line 8x8 baking dish with parchment paper.
02 -
Heat chocolate, condensed milk, butter, salt and vanilla in heavy pan over low heat.
03 -
Stir constantly until smooth, about 5-7 minutes. Keep heat low to prevent scorching.
04 -
Remove from heat, whisk in black food coloring until desired shade.
05 -
Pour into lined pan, add sprinkles if using.
06 -
Let cool, then cover and chill minimum 8 hours.
07 -
Remove with parchment and cut into 1-inch squares.