Prepare the glass: If you'd like a gingerbread cookie rim, first dip the rim of a chilled martini glass into a shallow dish of water or simple syrup, and then into a plate of crushed gingerbread cookies or graham crackers. Set aside.

Combine ingredients: In a cocktail shaker, add the vodka, gingerbread syrup, Kahlúa, and half-and-half. Fill the shaker with ice.

Shake it up: Shake the mixture vigorously for about 15-20 seconds, or until the outside of the shaker becomes frosty.

Strain and serve: Strain the mixture into the prepared martini glass.

Garnish: Top the cocktail with a dollop of whipped cream, a sprinkle of crushed gingerbread cookies or graham crackers, and a cinnamon stick, if desired.

Enjoy your festive Gingerbread Martini!