I was looking for a quick treat using whatever I had on hand. I don't have buttermilk, but used the age-old substitution (milk, soy milk in my case, and a squeeze of a lemon = buttermilk). I didn't add the ice since this seemed to be perfect just the way it was. I enjoyed the tartness the cranberry juice gave the smoothie! Yum! I will make again.
Pros: Easy, had everything on hand