Dip rim of chilled martini glass into the Toasted Marshmallow Syrup and then into graham cracker crumbs, set aside.
Fill mixing tin with ice, Vodka, Toasted Marshmallow Syrup, chocolate syrup and Half & Half; cap and shake.
Drizzle chocolate syrup in a spiral from bottom of glass up to the rim.
Strain cocktail into the martini glass and garnish.
Sprinkle chocolate shavings on top and place over three Oreo coated marshmallow halves speared with a bamboo skewer. Note: As an optional garnishment, toast 3 mini marshmallows, spear and place on top.