
- 1 cup stout (Guinness)
- 1 cup unsalted butter
- 3/4 cup unsweetened cocoa powder
- 2 cups all-purpose flour
- 2 cups sugar
- 1 ½ tsp. baking soda
- 3/4 tsp. salt
- 2 large eggs
- 2/3 cup sour cream
- 8 tbsp. unsalted butter, soft at room temperature
- 3-4 cups confectioners' sugar, sifted
- 4-8 tbsp. Bailey's Irish Cream