[header] How to make a cookies and cream milkshake [title] Crush the oreo cookies into a fine crumble and set them aside. [step] You can do this by pulsing them in a blender, or by crushing them in a plastic, zippered bag with a rolling pin. Keep crushing them until you get a coarse crumble. 
The pieces should be finely crushed, like coarse sand or coffee grounds. [title] Put the ice cream and milk in a blender, and blend until smooth.