Irish Car Bomb Cucpakes Ingredients For the Guinness Chocolate Cupcakes 1 cup stout (such as Guinness) 1 cup (2 sticks) unsalted butter 3/4 cup unsweetened cocoa powder (preferably Dutch-process) 2 cups all purpose flour 2 cups sugar 1 1/2 teaspoons baking soda 3/4 teaspoon salt 2 large eggs 2/3 cup sour cream Ganache Filling