Ranch Yogurt Dressing  

1/3 Cup Plain low-fat yogurt
1/2 Cup Buttermilk

3 Tbs. Reduced-calorie mayonnaise
1 Tbs. Dry ranch-style salad dressing mix

In a small bowl, combine yogurt, buttermilk and mayonnaise. Add dressing mix; stir until blended. Cover tightly; refrigerate until served, up to 5 days. Stir before serving. Makes about 1 Cup