Combine the mayonnaise, buttermilk, sour cream, and pickle juice in a bowl. Mix them until the mixture is smooth and creamy.

Add the fresh parsley, garlic powder, onion powder, salt, and black pepper to the mixture.

Mix thoroughly to ensure all ingredients are well incorporated.

Adjust the seasoning to your preference. If you want a thinner consistency, add a bit more buttermilk.

Refrigerate the dressing for at least an hour to let the flavors meld.

Stir well before serving. If it has thickened in the fridge, you can loosen it with a splash of buttermilk.