1/4 cup peanut butter
2 bananas (broken into chunks)
1/2 cup oatmeal
8 ice cubes
In a blender, combine all ingredients. Blend until smooth. Serve immediately.
For a chocolate version, add 4 tablespoons of Nesquik, or even chocolate slim fast type stuff. It's good, too.
I've also tried tossing in 1/3 cup extra peanuts. That's good, too!