They basically do the job of ice cream, but with way fewer calories, and way more nutrition.
1 c (8oz) Organic Fat Free Plain Yogurt (140 Calories, 8g Protein)
1 c (8oz) Organic Blueberry or Pomegranate Juice (130 Calories)
1 c (8oz) Sliced Organic bananas, frozen (100 Calories)
1 c (8oz) Any other frozen fruit: mango, strawberry, papaya, blackberry, etc. (100 Calories)
And don't drink the whole thing. If you're good at math, you can see that this makes a LOT of smoothie (32oz). This blender will serve 2 easily, but in my house it serves 3. And at 156.7 calories for 10.7oz, I may never go back to ice cream.