INGREDIENTS
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10 tablespoons unsalted butter (, softened (1 stick plus 2 tablespoons))
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3/4 cup packed brown sugar
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1/4 cup granulated sugar
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1 large egg (, room temperature)
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1 1/2 teaspoons vanilla
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1 cup all-purpose flour (, spooned and leveled)
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2/3 cup cocoa powder
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1/2 teaspoon baking soda
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1/4 teaspoon salt
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1 1/4 cup chocolate chips - semi-sweet or dark