Smoothie is a household favourite. I use it to get nutrients in my little one and it helps to finish off left over fruit. The high protein low carb craze means I had to try protein rich almond milk in my smoothie. Now, I have to warn you if you are making it for your kid, use full fat milk and add some honey or maple syrup for taste.
A glassful would keep you full for a good few hours..... Helps me 'the snacker'. :)