Ranch Salad Dressing Create your own Ranch Salad Dressing by blending mayonnaise, buttermilk, dried parsley, garlic powder, onion powder, salt, and pepper until smooth. A cost-friendly alternative without sacrificing the classic ranch flavor! 1 cup light mayonnaise1 cup buttermilk or light sour cream or low-fat plain yogurt (regular, Greek, or non-dairy)1 tablespoon dried parsley½ teaspoon