Chocolate Stout Cupcakes with Whiskey Ganache Filling and Irish Cream Frosting

INGREDIENTS

1 cup

stout (such as Guinness)

1 cup

unsalted butter

3/4 cup

unsweetened cocoa powder (preferably Dutch-process)

2 cups

all purpose flour

2 cups

sugar

1 1/2 tsp

baking soda

3/4 tsp

salt

large eggs

2/3 cup

sour cream

8 oz

bittersweet chocolate

2/3 cup

heavy cream

2 tbsp

butter, room temperature

2 tsp

Irish whiskey (optional)

to 4 cups confections sugar

1 stick

or 4 ounces) unsalted butter, at room temperature

1/4 cup

to 1/2 cup tablespoons Baileys