To make 12 edible chocolate cups, use 500 g plain chocolate. Make the cups in cases with straight, almost upright sides, such as plastic drinking cups or muffin cases. Chill, then fill with soufflé mixture once set.
Tape double-thick bands of baking parchment around the set cases, leaving a collar of 2-4 cm. Place on a baking tray and fill with 1 quantity white chocolate soufflé. Chill until set.
Before removing the paper, sift cocoa powder over the individual soufflés. Decorate with piped whipped cream and hazelnuts dipped in caramel.