In a medium mixing bowl, whisk together the Greek yogurt, lemon juice, Worcestershire sauce, garlic powder, onion powder, salt, and black pepper until the base is smooth.
Gently fold in the blue cheese crumbles and chopped chives using a spatula to maintain texture.
Evaluate the viscosity of the dressing; if a thinner consistency is desired for salads, whisk in milk one tablespoon at a time.
Transfer the dressing to an airtight container.
Refrigerate for a minimum of 30 minutes prior to service to allow the flavors to emulsify and develop.