Blend the bananas with one egg white.

Whip the remaining 3 egg whites with the sugar until stiff peaks form to make a meringue.

Mix the banana mixture with the almond flour and all-purpose flour.

Gently fold in the meringue.

Pour the batter into a greased and floured baking dish.

Bake for 35 minutes at 340°F (170°C).

Let cool before removing from the pan.