Whisk in the remaining ingredients. Taste and add more salt if needed.
1 cup mayonnaise, 1/2 cup sour cream, 2 teaspoons fresh dill, 2 teaspoons dried parsley, 1 teaspoon dried chives, 1 1/2 teaspoons garlic powder, 1/2 teaspoon onion powder, 1 teaspoon kosher salt, 1/4 teaspoon black pepper