firstly, in a blender add milk.
also add cocoa powder and powdered sugar.
additionally add vanilla ice cream. optionally for more chocolate flavour add in chocolate ice cream.
furthermore add ice cubes.
blend to frothy and foamy milkshake.
further, take a tsp of chocolate syrup and decorate the sides of glass.
pour the prepared milkshake.
finally, decorate with more whipped cream or a scoop of ice cream just before serving chocolate milkshake.