I just made some onion dip using greek yogurt instead of sour cream, came out great! I used Dannon Plain Greek yogurt, 0% fat, and the only ingredient is cultured grade A non-fat milk.
I used three 5.3oz. containers of yogurt, and mixed with a packet of dry onion soup mix (I used Lipton).
__________________ "We can judge the heart of a man by his treatment of animals." ~Immanual Kant~