Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a large bowl, mash the ripe banana until smooth.
Add nut butter, honey (or maple syrup), and vanilla extract to the banana, mixing until well combined.
In a separate bowl, combine rolled oats, baking soda, and salt.
Gradually add the dry ingredients to the wet mixture, stirring until fully incorporated.
If desired, fold in dark chocolate chips and chopped nuts.
Using a tablespoon, scoop dough onto the prepared baking sheet, spacing them about 2 inches apart.
Bake in the preheated oven for 12-15 minutes, or until the edges are golden brown.
Remove from the oven and let the cookies cool on the baking sheet for 5 minutes.
Transfer to a wire rack to cool completely before serving.