1 cup real mayonnaise
½ cup sour cream
¼ cup Italian flat-leaf parsley leaves, minced
2 tablespoons fresh dill, minced
1 tablespoon minced fresh chives
½ teaspoon ground black pepper
1 teaspoon garlic powder
½ teaspoon onion powder
¼ teaspoon kosher salt
¼ to ¾ cup buttermilk (as needed for desired consistency)