INGREDIENTS
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1 1/4 cup flour
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1/2 cup unsweetened cocoa powder
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3/4 teaspoons baking soda
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1/4 teaspoon baking powder
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1/4 teaspoon espresso powder
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1/4 teaspoon salt
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8 tablespoons unsalted butter, softened
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3/4 cups sugar
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1 egg
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1/4 teaspoon vanilla extract
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4 tablespoons unsalted butter, softened
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1/4 cup vegetable shortening
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2 cups plus 1/3 cup powdered sugar
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1 vanilla bean, seeds scraped
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1 teaspoon vanilla extract
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2 teaspoons bourbon