01 - Fill a cocktail shaker with ice.
02 - Pour vodka, cooled espresso, coffee liqueur, and pumpkin spice syrup into the shaker.
03 - Shake vigorously until the mixture is well-chilled and frothy, about 15 seconds.
04 - Strain the mixture into a chilled martini glass.
05 - Sprinkle a pinch of ground cinnamon or pumpkin pie spice on top. Garnish with coffee beans or a swirl of whipped cream if desired. Serve immediately.