INGREDIENTS
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1 stick unsalted butter, softened
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1/3 cup granulated sugar
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1/3 cup packed light brown sugar
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1 large egg
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1 teaspoon vanilla extract
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1 cup all-purpose flour
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1/4 cup natural cocoa powder (not Dutch-process)
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1/2 teaspoon baking soda
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1/2 teaspoon salt
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1 cup chocolate chunks