Preheat the oven to 350ºF. Line a baking sheet with parchment paper, and set aside.
In a mixing bowl, mash the bananas until smooth. Add the coconut and nut butter, and mix until well combined. Stir in any additions you like. Pop the cookie dough into the freezer to firm up a bit (15 minutes or so).
Scoop the dough onto the lined baking sheet. Use the back of a spoon or measuring cup to flatten each one just a little, to the thickness you prefer.
Transfer into the oven & bake at 350ºF for 12 to 15 minutes. Allow them to cool & enjoy!