Combine salt, mashed bananas, cake flour and potato flour. Add to beaten egg yolk mixture.
Beat egg whites until stiff and fold into batter.
Fold in chopped nuts and pour mixture into an angel cake pan or spring form.
Bake 40-45 minutes.
Frost as desired.
Notes
Eggs are easier to separate when cold. Once separated, let whites and yolks sit out until they reach room temperature as at that point the whites whip better and become more voluminous.