Preheat your oven to 200 ° C.
Separate the white from the yolks (weigh the white and the yellow to know the weight of your eggs and adapt the recipe accordingly).
Melt the butter and set aside for it to cool.
Mix the yolks with the sugar (160 gr) until the mixture whitens.
Gradually add the flour mixed with the half sachet of baking powder and the cooled melted butter.
Whisk the egg whites and gently fold them into the mixture.
Butter your cake pan.
Pour half of the mixture, arrange half of the apples, cover with the rest of the cake batter, then arrange the rest of the apples on top.
Bake for 30 minutes.