INGREDIENTS
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6 tablespoons unsalted butter, room temperature
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3/4 cup packed light-brown sugar
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1 large egg
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1 teaspoon pure vanilla extract
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1 cup all-purpose flour
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2 tablespoons Dutch-process cocoa powder
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1/2 teaspoon baking soda
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1/2 teaspoon coarse salt
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1 1/2 cups (10 ounces) semisweet chocolate chips