Preheat your oven to 350°F (175°C).
In a large bowl, combine rolled oats, flour, baking soda, cinnamon, and salt.
In another bowl, mix mashed banana (or applesauce), honey (or maple syrup), and vanilla.
Pour the wet ingredients into the dry ingredients and stir until combined.
Add chocolate chips and nuts, mixing well.
Using a tablespoon, scoop dough onto a baking sheet lined with parchment paper.
Flatten each cookie slightly with the back of the spoon.
Bake in the preheated oven for 12-15 minutes until golden brown.
Remove from the oven and let cool on the baking sheet for 5 minutes.
Transfer cookies to a wire rack to cool completely.