firstly, in a small bowl dissolve 1 tsp of instant coffee powder with 1 tbsp of warm water. alternatively use 3 tbsp decoction.
further in a blender add milk and prepared instant coffee decoction.
also add cocoa powder and powdered sugar.
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 cold coffee milkshake.