Fill the glass or mug with hot water to preheat it. Empty water out.
Pour piping hot coffee into the warmed glass or mug about ¾ full.
Add the brown sugar and stir until dissolved.
Blend in the whiskey.
Top with the whipped cream.
Serve hot.
Notes
*****Sometimes you can set up a service area. Just have hot coffee brewing, place the sugar in a bowl, place the whiskey with some sort of measuring device and place the whipped topping in a bowl that is set in a bowl of ice cubes. If you have a very large group, you might just want to buy the Redi-Whip.
Recipe by Geaux Ask Alice! at https://geauxaskalice.com/heart-warming-irish-coffee/