For the base, knead all the ingredients into a smooth dough. Shape into a ball and wrap in cling film and place in the refrigerator for at least 30 minutes.
Wash the apples, quarter them, remove the core and cut into thin wedges. Melt the butter and mix it with the other ingredients.
Roll out the dough around 35 cm on a floured work surface and place it in a greased tart pan (28 cm Ø) with a lift-off base, pulling up one edge. Prick the bottom several times with a fork. Spread the apples on top and pour the sugar butter and flaked almonds on top.
Bake in a preheated oven at 175 ° C top / bottom heat or at 150 ° C fan for about 55 minutes. Cover the tart with aluminum foil after 35 minutes. Allow to cool in the mold.
Remove from the mold and serve sprinkled with powdered sugar.