Whisk together the cream, milk, 2 tbsp brown sugar, vanilla, and salt in a medium saucepan. Place the pan over medium heat and cook it, whisking occasionally, until it starts to simmer. Remove the pan from the heat and whisk in the chopped chocolates, stirring until they’re melted. Carefully taste the mixture and add more sugar, if desired.Place 2-3 scoops of ice cream into mugs. Pour hot chocolate on top of the ice cream, and garnish with whipped cream, fudge sauce, chocolate shavings, or other toppings. Serve with spoons for maximum slurping.