01 - In a medium mixing bowl, combine the crumbled blue cheese, sour cream, mayonnaise, and buttermilk if using.
02 - Stir well with a spoon or whisk until mostly smooth, leaving some small blue cheese chunks for texture.
03 - Add the chopped chives, lemon juice, garlic powder, black pepper, and salt, then fold everything together until evenly distributed.
04 - Taste the dip and adjust salt, pepper, or lemon juice as needed to balance the flavors.
05 - Transfer to a serving bowl, cover tightly, and refrigerate for at least 30 minutes to let the flavors meld together.
06 - Serve chilled alongside celery sticks, carrot sticks, buffalo wings, crackers, or potato chips.