Low Cal Smoothie Recipe

I'm always looking for ways to incorporate more fruits and veggies into my diet. I love smoothies, but it's hard to distinguish what's actually good for you at most smoothie places. Most of them are loaded with sugar which defeats the purpose of having the smoothie in the first place. I made a black forest fruits smoothie today that turned out really good. Here's the recipe!

Blend:

1 cup of nonfat greek yogurt
1/2 cup frozen berries (I used a black forest fruits mix that had cherries, blackberries, grapes and black currants but you can choose whatever medley you'd like)
1/2 banana
1/2 cup vanilla soy milk