Great Lower Calorie Breakfast Shake

I have one of these almost every morning - I put it into an insulated mug (no lid), and take it to work.
1/2 frozen banana (good use for those very ripe bananas)
6-8 ounces of light soy milk (vegetarians, use fat free milk for low cal)
1/3 cup crushed ice (approximate)
A few dashes of cinnamon to taste
A capful of vanilla extract (don't use the cheap stuff - ever! Get the real thing).

I use my immersion blender, but you could use any blender to blend this all up - till ice and banana is all blended in.

If you're looking to gain weight, use regular soy or cow's milk, (and throw in some protein powder).