Add the unsweetened plant-based yogurt to a medium mixing bowl.
Then, add lemon juice, Dijon mustard, and nutritional yeast (if using).
Sprinkle in garlic powder, onion powder, and salt.
Whisk everything until smooth and creamy.
Add finely chopped parsley, chopped dill, and chopped chives.
Gradually pour in water, whisking between additions, until the dressing reaches your preferred consistency.
Season with freshly ground black pepper to taste. Adjust lemon juice or salt if needed.
Cover and refrigerate 30 minutes before serving to allow the flavors to blend.
Enjoy as a dressing, dip, or sauce!