Set up a bain-marie (double boiler!) by placing a heatproof bowl over a pot of simmering water.
To the double boiler, add 8 ounces roughly chopped chocolate pieces to the bowl and melt until it reaches a smooth consistency.
Meanwhile, in a separate pot, heat 1½ cups milk, ½ cup heavy cream, and 2 teaspoons sugar to just about a simmer—be careful not to let it boil. Note: Look for any bubbles forming on the sides and you will know to remove the pot from the heat.
Add the melted chocolate to the warmed milk, cream, and sugar and whisk well until it reaches a smooth, creamy consistency.
Pour directly into mugs and serve with the whipped cream on the side. Add booze if desired.