Preheat oven to 350 F. Grease baking sheet or line with parchment paper.
Mash banana in a bowl. Mix in oats and all other ingredients. Roll mixture into 3 medium balls (or 6 small balls). Place on sheet.
Bake for approx. 12 minutes (10 if small cookies) until lightly browned on top.
Notes
Store in a container or bag in the fridge for up to 5 days
Monash has updated the FODMAP serving sizes for bananas. Unripe bananas (no brown spots) are low FODMAP at 1 medium banana (100g). Ripe bananas (brown spots) are low FODMAP only at 1/3 medium banana. If you use an unripe banana for this recipe the safe serving size is 3 large cookies. If you use ripe banana the safe serving size is 1 large cookie. I have made this recipe using unripe and ripe bananas and both taste great!
Dried cranberries and raisins (not sultanas) are low at 1 tbsp
If you add in nuts, make sure to choose low FODMAP options (pecans and cashews are high in GOS and fructans; almonds and hazelnuts low at 10 nuts)
This is a great recipe to double or triple so you have snacks on hand for days