INGREDIENTS
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1 1/2 cups all-purpose flour
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1/2 cup good-quality unsweetened Dutch-process cocoa powder
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1 teaspoon baking powder
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1/2 teaspoon salt
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1/2 cup (1 stick) unsalted butter, softened
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1 1/2 cups sugar
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1/2 cup vegetable shortening, substitute 1/2 cup unsalted butter, melted and cooled
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1 large egg
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1 1/2 teaspoons pure vanilla extract