Separate the eggs, beat the egg whites until stiff. Mix in the lactose-free butter with a hand mixer and gradually stir in the sugar, then add the egg yolks one at a time while stirring. Then work in both types of almonds and the pressed or grated jacket potatoes. Finally, carefully fold in the stiffly beaten egg white.
Line a springform pan (24 cm in diameter) with baking paper, fill in the almond mixture and bake in the preheated oven at 175 ° C top / bottom heat for about 45 minutes.
If you want, you can dust the almond cake with a little powdered sugar after it has cooled down.
This goes well with fruit compote or a cranberry cream.