To prepare the whipped topping, pour the heavy cream into a medium-sized bowl and whip it with a hand mixer until thick. Add the confectioners sugar and blend until incorporated. Set aside.
To prepare the coffee, warm a coffee mug by running it under hot water. Dry the mug thoroughly, then pour in the coffee, whiskey, liquor, and brown sugar.
To garnish the coffee, warm a spoon, scoop a dollop of whipped topping from the bowl, and allow it to run down the back of the spoon into the coffee. Do not let the topping ''break'' the surface of the coffee, otherwise it will sink and begin to melt. Serve immediately.
Cover and refrigerate any leftover whipped cream. Use within two days.
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