Rim the inside of a martini glass with a thin layer of marshmallow fluff.
Roll the glass in red and green sprinkles to coat.
Set aside.
Fill a cocktail shaker with ice.
Add Rumchata, vanilla vodka, Amaretto, half and half, and simple syrup.
Shake vigorously for about 20 seconds or until well-chilled.
Strain the cocktail into the prepared martini glass.
The drink will create a beautiful streaking effect in the glass.
Serve immediately and enjoy!
