Creamy Parm Dressing Ingredients: 10 1/2 oz, buttermilk 16 oz. mayonnaise 5 oz. sour cream 2 1/2 oz. Hidden Valley Ranch Dressing Mix 1/2 pinch scallions, chopped 2 oz. red wine vinegar 2 1/2 oz Parmesan cheese, grated 3 T. chives 1 t. cracked black pepper Directions: In a mixing bowl add buttermilk, mayonnaise and sour cream. Mix with a wire whisk. Once completely blended, add the remaining ingredients and mix well. Refrigerate immediately. Dressing should keep for 3 to 4 days,.