It's just not Irish coffee without the right whiskey, and a nice dose of cream and sugar.
1 1/2 oz. Irish Whiskey 1 Tbs. brown sugar 2 oz. heavy cream coffee float green crème de menthe
Fill glass with hot water to pre-heat then empty. Pour piping hot coffee into warmed glass until it is about 3/4 full. Add 1 Tbs. brown sugar and stir until completely dissolved. Blend in Irish Whiskey. Gently top with a collar of slightly whipped heavy cream by pouring gently over a spoon. Color with crème de menthe and enjoy while piping hot.