In a small bowl combine 3 tablespoons mayonnaise, 2 tablespoons buttermilk, 2 tablespoons sour cream, 1 teaspoon champagne or white vinegar, 1 clove garlic (pressed or finely minced), 1 tablespoon chopped chives, 1 tablespoon Italian parsley (minced), 1 teaspoon kosher salt, ½ teaspoon freshly ground black pepper, ½ teaspoon dried dill, ¼ teaspoon onion powder, and a pinch of cayenne pepper.

Whisk vigorously until the mixture is smooth and uniform in color and texture.

If the dressing is thicker than you want, thin it by adding more buttermilk, 1 teaspoon at a time, whisking after each addition until you reach the desired consistency.

Taste and, if desired, adjust seasoning using only the ingredients listed.

Cover and refrigerate at least 30 minutes before serving to let the flavors meld; stir or whisk briefly again just before serving.