Irish Coffee [1]
From Cocktail Database [2]

1 1/2 oz Irish whiskey
1/2 oz Irish Mist
Fill with hot black coffee
whipped cream
Float green creme de menthe (optional)
Serve in a Irish coffee glass (6.0 oz)

1. Fill a glass mug with whiskey and mist and very carefully, slowly pour the hot black coffee over the top of the backside of a spoon onto the whiskey.
2. Float with creme de menthe if desired and with whipped cream.