These cookies are healthy and delicious without any added sugar or sweetener. One batch makes six cookies, so you might want to double it if you plan on sharing. :)
Preheat your oven to 180℃ (350℉) and line a pan with parchment paper or a silicone baking mat. Set aside.
Using a fork, mash the banana in a large bowl until smooth. Add the oat pieces and oat flour and mix well. Stir in the almond pieces (or dark chocolate chunks) until combined.
Portion the batter into six roundish cookies in the pan. Flatten them so they are around 1.5 cm (or half an inch) thick.
Bake for 20-25 minutes on the centre rack until the cookies start to brown around the edges. Rotate the pan halfway through the baking time. I recommend setting the timer for 10 minutes, rotating the pan, and then setting the timer for 10 more. Check the cookies at this point, if they need a few more minutes bake them for 5 minutes longer.
Let cool for 5-10 minutes before digging in.