Leave the butter at room temperature until soft.
In a bowl, mix butter and sugar until creamy.
Add egg yolks and mix evenly.
Sift in cake flour, almond flour, and baking powder, then mix with a spatula.
Shape the dough into balls and place them on a baking tray.
Lightly press the center with your finger to make an indentation.
Bake in a preheated oven at 170°C for 15 minutes.