Basically I mash 2-3 bananas (or however many are overripe), mix in oatmeal and applesauce until everything is combined and it resembles a loose cookie dough consistency. Add raisins, handful of nuts, even chocolate chips - whatever you like. If you want you can add cinnamon and nutmeg for more flavor or other seasonings you like. Let this mix sit for at least 5 mintues to allow the oatmeal to absorb a little of the moisture. I spoon it out with my melon baller and then squish them down flat on a cookie sheet. Cook in a slow oven @ 275 for 20 minutes or until the "cookies" are set and bottoms are lightly browned.
If you are going to make bars, I would definitely spray or lightly oil the bottom of the baking pan as these tend to stick, especially when you don't cook them long enough.