Using a butter knife, spread a thin layer of icing on onto the rim of a martini glass.

On a small plate, sprinkle your desired amount of sprinkles and press the icing-coated rim into them to create a festive border.

Fill a cocktail shaker with ice.

Add the vanilla vodka, Baileys Irish Cream, amaretto, and milk.

Secure the lid and shake vigorously for 15–20 seconds, until well chilled.

Strain the mixture into the prepared martini glass. Optional: Garnish with a candy cane, whipped cream, or a sugar cookie for extra flair.