Melt the butter. Meanwhile chop chocolate and candy. Mix flour, sugar, 1 pinch of salt and liquid butter first with the dough hooks of the mixer, then with your hands to crumble. Briefly knead the chocolate, sweets and nuts. Chill the crumble dough for about 30 minutes.
Preheat oven (electric cooker: 200 °C/circulating air: 180 °C/gas: see manufacturer). Line a baking tray with baking paper. Place about 30 walnut-sized heaps of the crumbled dough on the baking tray. Bake in a hot oven for 8-10 minutes until golden brown. Let the crumble confectionery cool down and dust with cocoa as desired.