In a medium bowl, combine mayonnaise, buttermilk, sour cream, and pickle juice. Mix well until smooth and creamy.
1/2 cup mayonnaise, 2 tbsp buttermilk, 1/4 cup sour cream, 1 tablespoon pickle juice
Add the fresh parsley, garlic powder, onion powder, salt, and black pepper. Mix well until all the ingredients are fully incorporated.
1 tablespoon fresh parsley, 1/2 teaspoon garlic powder, 1/2 teaspoon onion powder, 1/4 teaspoon salt, 1/4 teaspoon black pepper
Taste the dressing and adjust the seasonings according to your preference. If you prefer a thinner consistency, you can add a little more buttermilk.
Once the dressing is well blended, cover the bowl and refrigerate for at least 1 hour to allow the flavors to meld together.
Before serving, give the dressing a good stir. If it thickens up in the fridge, you can add a splash of buttermilk to loosen it up.