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 spread to medium). Set aside.
In another bowl, put the egg yolks, salt, vanilla extract, butter and condensed milk.
Whisk everything well.
Add all purpose flour, Almond flour and baking powder.
Mix everything well until smooth.
Add the egg whites then gently mix. Try not to deflate the egg whites.
Pour the batter in a greased pan. I have used a 7 inch round springform pan lined with parchment paper.
Bake in 340°F preheated oven for about 50 minutes (more or less depending on your oven).
Let cool before cutting.