How to Make It
Whisk together 4 cups half-and-half and 1/2 cup canned or jarred dulce de leche in a medium saucepan. Simmer over medium, stirring constantly, until heated through, about 10 minutes.
Remove from heat, and whisk in 8 ounces chopped dark chocolate, 1/3 cup of Drambuie, 2 teaspoons vanilla extract, and 1/4 teaspoon kosher salt until the mixture is smooth.
Next, beat 1 cup of cold heavy cream in a cold bowl with an electric mixer on high until stiff peaks form, about 1 minute.
Pour hot chocolate mixture into 4 serving cups. Top each with whipped cream, a drizzle of dulce de leche, and chopped or shaved dark chocolate. Serve with chocolate rolled wafer cookies (such as Pirouette).