In a lidded jar combine the yogurt, 1 tablespoon of the milk, parsley, dill, garlic powder, salt, and black pepper.Cover with the lid and shake to combine. If your Greek yogurt is very thick, add an extra tablespoon of milk. You can also do this in a blender; if so, add the fresh parsley at the very end so it doesn't blend into the ranch.
Store in the refrigerator for up to a week.
Notes
Swap the 2 tablespoons of fresh parsley with 1 tablespoon of dried parsley.