In a mixing bowl, combine mayonnaise, buttermilk, white wine vinegar, and Dijon mustard.

Whisk until smooth and well combined.

Add garlic powder, onion powder, oregano, basil, salt, and black pepper.

Whisk again until all ingredients are fully incorporated.

Taste and adjust seasoning if necessary.

Transfer the dressing to a jar or bottle for storage.

Refrigerate for at least 30 minutes before serving to allow flavors to meld.