In a small saucepan over medium heat, whisk together the unsweetened cocoa powder, granulated sugar, water, and a pinch of salt. Continue stirring for about 2 minutes until the mixture simmers and thickens slightly. Once combined, remove from heat and stir in the vanilla extract.

Brush the rim of your coffee mug with chocolate sauce, then dip the rim into graham cracker crumbs for an even coating.

Pull two shots of espresso or brew a strong cup of coffee. Aim for rich, bold coffee.

In a small saucepan or frother, heat or froth 1 cup of milk until hot and foamy, reaching about 150°F.

In your prepared mug, pour in 2 tablespoons of the chocolate sauce, then add the espresso shots. Gently top with steamed milk, leaving room for toppings.

Generously spoon whipped cream on top, sprinkle with graham cracker crumbs and optional chocolate shavings.

Add a handful of mini marshmallows on top of the whipped cream. For a twist, use marshmallow fluff or lightly toasted marshmallows.