Take a bowl and coarsely crush the oreo biscuits in it. you dont need to powder them, they should be crushed enough to be blended in to a shake.

Now milk, sugar and chocolate syrup in a blender also. add oreo and ice-cream in the blender. blend well all the ingredients until combined completely.

Now take a glass, i have used chocolate syrup and drizzled over the inside surface of the glass.

Prepared milkshake into a glass finally,top the milkshake with the Oreo biscuits. serve immediately with a straw.