INGREDIENTS
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1/3 cup all-purpose flour*
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1/2 teaspoon cornstarch
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1/4 cup granulated sugar
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1/3 cup Dutch-process cocoa powder**
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1/2 teaspoon kosher salt
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3 tablespoons unsalted butter, melted
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1 & 1/4 cups all-purpose flour*
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3/4 cup Dutch-process cocoa powder**
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3/4 teaspoon baking powder
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1/4 teaspoon baking soda
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1 & 3/4 teaspoons kosher salt
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1 cup unsalted butter, softened
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1 & 1/2 cups granulated sugar
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2 tablespoons light corn syrup
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1 large egg
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1/4 teaspoon vanilla extract
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2 ounces semisweet (about 60%) chocolate, melted