INGREDIENTS
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1 bottle Guinness
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1 cup (2 sticks) unsalted butter
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3/4 cup unsweetened cocoa powder
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2 cups all purpose flour
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2 cups sugar
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1 1/2 teaspoons baking soda
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3/4 teaspoon salt
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2 large eggs
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2/3 cup sour cream
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For the Bailey's buttercream:
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1/2 cup (1 stick) unsalted butter, softened
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3 to 4 cups confectioners’ sugar
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3 tablespoons Bailey’s Irish Cream