Crush well the frozen milk packet, using a heavy rod or with the back of a heavy spoon.
Add the peeled banana, sugar, chocolate drink powder, peanuts or cashew nuts and the crushed frozen milk into a blender and blend well until thick and frothy
Pour in the milkshake among two tall glasses, add ice cream scoops and garnish with peanuts or chopped cashew nuts
Serve chilled.
