Preheat oven to 180°C. Line a tray wth baking paper and set aside.

In a bowl, place the flour and brown sugar and mix.

Rub the butter through the flour until it resembles crumbs.

Pour the milk into the mashed banana and mix.

Add the banana and milk mix to the crumbs and using a flat bladed knife, cut the mix together until just combined.

Turn out onto baking tray and pat into a large round. It will be sticky and soft.

Press the walnuts into the top of the damper and bake for 40 minutes.