Creamy Irish Cream Liqueur just like your favorite from the store. Use it in all of your favorite Irish Coffee and cocktail recipes measure for measure. And say, "Yum"
Non-alcoholic variation: For a non-alcoholic version use 2 cups strongly brewed Earl Grey tea for the whiskey and 1 teaspoon instant coffee. I know, it sounds weird but it works. This will not keep a long time, however, because of the lack of alcohol. Plan on drinking it within a week.