In a medium bowl, whisk together 1/2 cup 1% buttermilk, 3 tablespoons mayonnaise, 2 tablespoons finely chopped chives, 1/2 teaspoon kosher salt, 1/4 teaspoon garlic powder, 1/4 teaspoon onion powder, 1/4 teaspoon dried parsley, 1/4 teaspoon dried basil, and fresh black pepper to taste until smooth.