In a mixing bowl, combine the mayonnaise and sour cream.

Add the white wine vinegar and lemon juice, whisking until smooth.

Stir in the dried oregano, basil, garlic powder, onion powder, salt, and black pepper.

If using, add the Parmesan cheese and parsley, mixing well.

Transfer the dressing to a jar with a lid and refrigerate for at least 30 minutes before serving to allow flavors to meld.