Separate the eggs.

Beat the egg yolks.

Slowly add the sugar and salt to the egg yolks, beating constantly until the mixture becomes lemon colored.

Add the mashed banana to the mixture while beating.

Add the potato flour to the mixture while beating.

Beat the egg whites until stiff peaks form.

Gently fold the beaten egg whites into the banana mixture.

Pour the batter into a tube pan.

Bake in a preheated oven at 350 degrees F (175 degrees C) for 45 minutes.

Let cool before serving.