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["Make the cupcakes: Preheat oven to 350u00b0F. Line 24 cupcake cups with liners. Bring 1 cup stout and 1 cup butter to simmer in heavy large saucepan over medium heat. Add cocoa powder and whisk until mixture is smooth. Cool slightly.", "Whisk flour, sugar, baking soda, and 3/4 teaspoon salt in large bowl to blend. Using electric mixer, beat eggs and sour cream in another large bowl to blend. Add stout-chocolate mixture to egg mixture and beat just to combine. Add flour mixture and beat briefly on slow speed. Using rubber spatula, fold batter until completely combined. Divide batter among cupcake liners. Bake cake until tester inserted into center comes out clean, about 17 minutes.", "Make the filling: Chop the chocolate and transfer it to a heatproof bowl. Heat the cream until simmering and pour it over the chocolate. Let it sit for one minute and then stir until smooth Add the butter and whiskey (if you're using it) and stir until combined.", "Fill the cupcakes: Let the ganache cool until thick but still soft enough to be piped. Meanwhile, using your 1-inch round cookie cutter or an apple corer, cut the centers out of the cooled cupcakes. You want to go most of the way down the cupcake but not cut through the bottom - aim for 2/3 of the way. A slim spoon or grapefruit knife will help you get the center out. Those are your ""tasters"". Put the ganache into a piping bag with a wide tip and fill the holes in each cupcake to the top.", "Make the frosting: Whip the butter in the bowl of an electric mixer, or with a hand mixer, for several minutes. You want to get it very light and fluffy. Slowly add the powdered sugar, a few tablespoons at a time.", "When the frosting looks thick enough to spread, drizzle in the Baileys (or milk) and whip it until combined. If this has made the frosting too thin (it shouldn't, but just in case) beat in another spoonful or two of powdered sugar. Ice and decorate the cupcakes."]
