Preheat oven to 350 degrees Fahrenheit. Grease a 9×13-inch pan and set aside.
In a bowl, beat egg whites until stiff peaks form.
Add one cup sugar and mix to combine.
In a separate bowl, combine egg yolks, the remaining one cup sugar, walnut flour, and banana.
Add yolk mixture to the beaten egg whites and mix to combine.
Pour into the prepared pan and bake for one hour and 15 minutes. Cool completely before slicing.
Directions
Notes:
This cake freezes well.
To make your own walnut flour, fit a food processor with the S blade and pulse whole or chopped walnuts until very finely ground.
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