If you want a less milky version, reduce the amount of milk you add to ¾ cup (177. 4 ml). Only turn the milk up to medium-high. Putting the milk on a higher heat will cause it to scald and form an annoying protein skin.
To make your drink even more Nutella-y, you can put Nutella into a piping bag used for frosting cakes, then pipe Nutella on top of the whipped cream as a substitute for chocolate sauce.
Bourbon is an alcohol that tastes excellent paired with chocolate. Other good options are rum and chocolate liqueur.
