Pour chocolate syrup on a small plate and set aside.Place finely ground graham cracker crumbs on another plate and set aside.Dunk the rim of a glass in the chocolate and then immediately in the graham cracker crumbs.Combine hot coffee/espresso with marshmallow fluff and stir until the fluff has almost melted.Pour coffee/marshmallow mixture into your blender along with the milk, 1 tablespoon chocolate syrup and optional sugar.Blend on low until everything has been fully incorporated.Fill a cocktail shaker with ice and then pour the coffee over that.Shake until chilled.Fill your drinking glass with ice and strain the coffee over the ice.Top with whipped cream, an extra chocolate drizzle, and graham cracker, if desired and serve immediately!