Pre-heat oven to 350 F.
Mash the bananas in a bowl with a fork until they form a thick, smooth paste.
Add the rest of the ingredients and mix until everything is combined into a dough.
Drop 16 spoonfuls onto a cookie sheet, shaping each spoonful into a cookie shape. The cookies will not change shape during baking, so make sure you create the cookie shape you want beforehand. You can make them larger and flatter or keep them as more of a haystack-style.
Bake for 15 minutes. They should be firm and slightly browned when done.
Add melted butter on top of each cookie to cover it and bake for additional 3 minutes (optional)
