A few weeks ago I was readingthis post by "Mrs. Ed". She said that if you make yogurt out of half and half you get the perfect "sour cream". Now I have made yogurt out of all kinds of milk and cream, but I had never tried half and half. Where have you been all my life? This is so rich and creamy, much better than dripped yogurt for a sour cream substitution. I plan on keeping this on hand so look for it in future recipes. I followed my basic yogurt recipe here and substituted half and half for the milk.