INGREDIENTS
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3/4 cup unsalted butter (1 1/2 sticks), room temperature
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1/2 cup packed light brown sugar
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1/2 cup granulated sugar
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1 egg
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1 teaspoon vanilla extract
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1 1/2 cups all-purpose flour
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1/2 teaspoon baking soda
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1/2 teaspoon salt
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1/2 cup mini-semisweet chocolate chips
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1/2 cup finely chopped walnuts, if desired