Roast the walnuts in a pan without fat. Remove. Chop cranberries and nuts very finely, up to 2 tablespoons each for decoration. Stir in 2 tablespoons of sugar and apple juice.
Mix the pudding powder, 4 tablespoons of sugar and 6 tablespoons of milk. Boil up the rest of the milk. Stir in the pudding powder and simmer for about 1 minute while stirring.
Spread the bottom of a greased, preferably square casserole dish with some caramel sauce. Then alternate layers of lasagne sheets, nut mixture and caramel sauce. Finish with lasagne plates and sauce.
Crumble the bread very finely. Mix with 2 tablespoons of sugar and sprinkle on the lasagne. Spread butter in flakes on top. Bake in the preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for 30-40 minutes.
Sprinkle the rest with nuts and cranberries and decorate with caramel-nut chips (see tip) if desired.