Pour half the mixture in the prepared baking pan and spread it evenly. Bake for about 20 to 30 minutes or until golden brown.
Beat the egg whites until stiff peaks form. Fold in the egg whites into the egg yolk mixture, gently.
Separate the eggs and put the egg yolk in the bowl of your mixer and the egg whites in another bowl. Add the powdered sugar to the egg yolks and beat until light and fluffy. Add the flour and mix well.
Preheat oven to 350 F degrees. Prepare a baking ban, I used a 9x13 inch pan, with parchment paper, butter it and sprinkle some flour.