Freeze vanilla yogurt in an ice cube tray. (Save extra yogurt cubes in a plastic zip-close bag inside the freezer to have on hand for future smoothies!)
Place 6 yogurt cubes, 4 WhoNu? ® Chocolate Sandwich Cookies and milk in blender and blend until smooth. (Blend in banana, if desired.)
Serve smoothie with whipped topping or as is.
Recipe by Food Fun Family at https://foodfunfamily.com/cookies-n-cream-yogurt-smoothie-recipe/