Brew your favorite coffee.
Add Irish whiskey to a mug.
Then fill the mug with coffee, leaving about 1/2-inch at the top for whipped cream.
Sweeten to taste with maple syrup or brown sugar or regular sugar. Gently stir to blend. (Something to try: instead if sugar, add a few mini chocolate chips to the hot coffee. They will partially melt into the coffee adding sweetness and a soft chocolate flavor.)
Top with whipped cream. (home made or from a can, whatever you have)
Variations:
Decorate. Sprinkle the top with a dash of cinnamon or chocolate shavings or mini chocolate chips.
Use decaf coffee
Serve it on ice. Pour cold brew coffee or brewed coffee over a cup filled with ice. Add half and half or heavy cream.
Make it quick. Skip the homemade whipped cream and add half and half or heavy cream instead.
Make it fancy. Add some Baileys Irish cream to alter the flavor. You can add it with the whiskey or in place of the whiskey.