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. Alternatively, you can whisk everything in a medium bowl. 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.
For an ultra-smooth yogurt ranch, blend everything in the blender on low speed.