INGREDIENTS
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3/4 cup butter or margarine, softened
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3/4 cup packed dark brown sugar
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1 egg
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1 teaspoon teaspoon vanilla extract
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1-3/4 cups all-purpose flour
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1 teaspoon baking soda
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1/4 teaspoon salt
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1-3/4 cups (7-oz. pkg.) HERSHEY'S S'mores Baking Pieces, divided