Smoothies are beverages made from a blend of fresh or frozen fruit with milk or a fruit juice. There are infinite variations of smoothies and below you can find a few easy smoothie recipes.
My recipes are basically 3/4 cup of a liquid (milk or fruit juice) and about 1 cup fruit.
As sweeteners I recommend honey, stevia or agave to your smoothie.
You can add protein powder but then you have to increase the amount of liquid to compensate.