Preheat oven to 180 degree c. Line a 20 cm square baking pan with parchment and grease it lightly. Set aside.

Take butter and white chocolate in a bowl and place it over a pan with simmering water. Melt it gently.

Now set aside for 10 mins so it cools down.

Now add in brown sugar, banana, egg, vanilla and salt. Mix well.

Take baking powder, white chocolate chunks and flour in a bowl and mix well.

Add this wet ingredients and mix well.

Spoon this in the pan and pop it oven. Bake for 30 to 35 mins.

Now remove it and cool it for 10 mins.

Slice and serve.