1 1/2 oz of rum
3/4 oz of white creme de cacao (or chocolate liqueur)
3 oz of eggnog
3 cup of vanilla ice cream (or ice cream)
Combine all ingredients in a blender. Blend until smooth. Pour into a parfait glass and top with whipped cream. Garnish with a few drops of green creme de menthe and a rolled cookie, and serve.