Peel and mash the banana, then stir in the nut/seed butter to combine.
Add the flour and mix to form a dough (using hands if needed).
Sprinkle extra oat flour on the bench to stop the dough sticking, then roll out the dough to approx 1/2 a cm in thickness.
Use cookie cutters or a knife and cut out the biscuits. Remove any excess dough, and roll that out, repeating until there is no dough left (this will make around 30-35 biscuits).
Cook in a preheated oven on 180c for 10-12 mins till cooked.
Allow to cool before serving.