Mash the Blue Cheese: In a small bowl, combine the blue cheese crumbles and buttermilk. Use a fork to mash the blue cheese into the buttermilk until you achieve your desired consistency. For a chunkier dressing, mash lightly. For a smoother dressing, mash more thoroughly.
Add Creamy Ingredients: Stir in the sour cream and mayonnaise, mixing until smooth and fully incorporated.
Season the Dressing: Add the chopped parsley, garlic powder, salt, and pepper. Mix well to ensure all the flavors are evenly distributed.
Adjust the Consistency: If the dressing is too thick, add more buttermilk, one tablespoon at a time, until it reaches your preferred consistency.
Chill and Serve: Cover and refrigerate the dressing for at least 30 minutes before serving to allow the flavors to meld together.
