I'm a big fan of smoothies. Here is a great recipe to start with. Throw all this into a high speed blender and you are set. It will be around 350 calories. If you have other suggestions please leave a comment. Thanks.
8 oz of milk
2-3 tablespoons of frozen fruit (Raspberries, blueberries, bananas, etc.)
1-2 tablespoons of yogurt one scoop of protein powder
Extras: Peanut Butter; Oatmeal; Ground Flax Seed; ice (if you use fresh fruit)