If you're nursing, oatmeal is really good for your supply, and you can also add to the effect by throwing in a few tablespoons of ground flax seed meal (also good for supply).
You can find the original recipe here.
Take 2 bananas and mash them in a bowl. Add 1 cup of quick oats. Add your mix ins (although they're optional). Drop onto a greased cookie sheet. I usually do a dash of cinnamon, dash of salt, and a few chocolate chips.
Bake at 350 until set (10-15 minutes).