"Homemade Oreos! Courtesy of my friend Sam on LiveJournal (http://copperbadge.livejournal.com)...."
INGREDIENTS
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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 -1 1/2 cup sugar
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10 tablespoons unsalted butter, at room temperature
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1 large egg
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1/4 cup unsalted butter, at room temperature
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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