Preheat oven (electric cooker: 200°C/circulating air: 175°C/gas: level 3). Wash apples, grate them dry and cut out the cores with an apple corer.
Press one of the fillings into the holes in the apple, possibly using a wooden spoon handle to push it in. Place in an ovenproof dish. Pour apple juice. Bake in the oven for about 1 hour until soft. If necessary, cover with aluminium foil after 30 minutes.
For the vanilla sauce, stir 5 tablespoons of milk and sauce powder until smooth. Bring the remaining milk and sugar to the boil. Stir in sauce powder, bring to the boil again, simmer for 1 minute. Serve baked apples with hot or cold vanilla sauce.
Marzipan filling: Finely chop the walnuts. Grate marzipan coarsely. Mix both with egg whites and almonds with the whisks of the mixer. Press the mixture into the apple holes and bake as described under point 2.
Poppy seed filling: Roast almonds in a pan without fat, remove. Mix cranberries, poppy seed mixture and almonds. Press into the apple holes and bake as described under point 2.
Nougat filling: Wash the raisins, drain and soak in rum for about 2 hours. Finely dice the nougat. Mix with the rum raisins and press into the holes in the apple. Bake as described under point 2.