Per preparare la crema spalmabile alle nocciole: tostare le nocciole in forno preriscaldato a 180°C per 10 minuti. Lasciarle intiepidire, metterle in un mixer con lo zucchero a velo e tritarle per almeno 1 minuto, fino a ottenere una pasta liscia e morbida, non granulosa. Aggiungere il cioccolato fondente lla vaniglia, precedentemente sciolto, e lavorare nel mixer per altri 2 minuti. Far riposare la crema in frigorifero per almeno 1 ora prima del suo utilizzo.
Montaggio del dolce: tagliare delle fette di panettone (o di pandoro) spesse circa 2 cm. All'interno di una teglia rettangolare foderata con carta forno creare uno strato con le fette tagliate, dressarvi sopra la crema alle nocciole con l’aiuto di una tasca da pasticciere e ricoprire con un altro strato di panettone che abbia lo stesso spessore di quello in precedenza posto sul fondo. Mettere in frigorifero o in congelatore per almeno 20 minuti.
Decorazione: prelevare il dolce dal frigorifero o dal congelatore e tagliare dei rettangoli di 9x6 cm. Stendere la massa di zucchero bianca più finemente possibile e, con la stessa, rivestire ogni singolo rettangolo.
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