INGREDIENTS
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For the chocolate wafers:
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•1 1/4 cups all-purpose flour
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•1/2 cup unsweetened Dutch process cocoa*
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•1 teaspoon baking soda
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•1/4 teaspoon baking powder
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•1/4 teaspoon salt
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•1 to 1 1/2 cups sugar**
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•1/2 cup plus 2 tablespoons (1 1/4 sticks) room-temperature, unsalted butter
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•1 large egg
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For the filling:
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•1/4 cup (1/2 stick) room-temperature, unsalted butter
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•1/4 cup vegetable shortening
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•2 cups sifted confectioners sugar
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•2 teaspoons vanilla extract