In a bowl, mash the banana really well. Add the rest of the ingredients and mix until fully combined.
I usually warm the entire bowl by keeping it near the oven (or microwave for a few seconds) to help the nut butter mix in faster.
Add the almond flour, coconut flour, starch, baking soda, baking powder and salt and mix in.
Add oats and chocolate chips and mix in. At this point you can also add cranberries, nuts chopped small, seeds, candied ginger etc.
Oil or flour your hands and make flat cookies from the mixture and place on parchment lined baking sheet.
Bake for 13 to 15 minutes until almost all golden. Cool completely and store in an airtight container on the counter for upto 2 days or refrigerated for upto a week..