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Break the vanilla biscuits and wafers into small pieces and place them in a large mixing bowl.
Add the finely chopped walnuts to the biscuit mixture and stir to combine.
In a saucepan, heat the milk gently with sugar, vanilla sugar, and cocoa powder. Stir continuously until the mixture thickens slightly and the sugar dissolves completely.
Remove the saucepan from heat and stir in the softened butter until smooth and creamy.
Pour the warm chocolate mixture over the biscuit and walnut mix. Stir well to coat all pieces evenly.
Transfer the mixture into a lined loaf pan or cake mold, pressing down firmly to compact.
Refrigerate for at least 4 hours, preferably overnight, until set.
Remove from the mold, slice, and serve chilled.
Serving and Storage Tips
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