In a bowl, mix mayonnaise, buttermilk, and sour cream.
Add parsley, dill, garlic powder, and onion powder to it.
Sprinkle salt and black pepper into the mixture.
Optionally, add dried chives and dried tarragon for flavor.
Whisk until smooth and herbs are evenly spread.
Taste and add more salt or pepper, if needed.
Pour dressing into a jar with a secure lid.
Refrigerate for 30 minutes to blend all the flavors.
Shake or stir before serving for best consistency.
Serve with salads, veggies, or as a tasty dip.