For years, I've been making this same smoothie for breakfast and have yet to tire of it. Keeps me going until lunch, and quantities can be varied to suit taste. I don't measure, just scoop!
1 tbsp frozen orange juice concentrate
1 scoop protein powder
1 banana or other fruit (optional)
1 cup soy milk
Whir together in a Magic Bullet and take along. It will remind you of an Orange Julius.
Soy milk works better than cow milk because it doesn't foam up.