Blend all the milkshake ingredients with a blender until smooth and evenly blend.
After the milkshake is blended, turn off the blender. Set aside.
With a spatula, decorate the inside of the glass with biscoff spread.
Pour the biscoff milkshake into the glass.
In a bowl, whisk heavy cream and sugar until hard peak, then transfer it into a piping bag.
Top the biscoff milkshake with whipped cream then sprinkle with some biscoff crumble and last stick the biscoff biscuits on the whipped cream.
Enjoy!