First, separate egg whites from egg yolks.
In the bowl of a stand mixer, whisk the egg whites until medium peaks form (start on low speed then increase the speed to medium). Set aside.
In a bowl, put the egg yolks, salt, butter and Dulce de leche.
Whisk everything well.
Add all purpose flour, Almond flour and baking powder.
Mix everything well until smooth.
Gently fold in the egg whites to the batter.
Pour the batter in a greased pan. I have used a 7 inch round springform pan.
Bake in 340°F preheated oven for about 50 minutes (to 1 hour).
Let cool before cutting.