Rim a martini glass with frosting or maple syrup and dip it into sprinkles. Set aside.
Fill a cocktail shaker with ice.
Add vanilla vodka, Irish cream, white chocolate liqueur, and half and half to the shaker.
Shake vigorously for about 15–20 seconds until chilled.
Strain into the prepared martini glass.
Top with extra sprinkles if desired. Serve immediately.