In a large bowl mix all the ingredients together. If it feels to thick, add a small amount of milk until you get to the right consistency.
Store in an airtight container in the refrigerator.
*** Depending on how thick your greek yogurt is you might need a tablespoon or two of milk to get to the right consistency for dressing. Add that one teaspoon at a time at the end until you get the dressing as thin as you'd like.