If making your own gingerbread syrup: in a medium saucepan, heat water and sugar over medium heat, whisking together until it becomes steamy and sugar dissolves. Add molasses, ground ginger, and cinnamon. Continue whisking 2-3 minutes more until ingredients are combined and everything is dissolved together.
To rim the glass, add a few Tablespoons of Christmas sprinkles to a shallow saucer. Using a butter knife, spread a thin layer of frosting to the rim of the glass. Dip the frosting layer into the sprinkles.
Fill the glass halfway with ice, followed by the vodka, half and half, Kahula, and 1-2 ounces of gingerbread syrup, to taste.
Give the drink a gentle stir to combine, then enjoy!
Notes
You can use store-bought gingerbread syrup or make your own.The homemade gingerbread syrup can be stored in an airtight container in the refrigerator for 2-3 days.