"Recipe adapted from Todd Wilbur's version of McDonald's Shamrock Shake www.TopSecretRecipes.com. I used to absolutely love it when McDonald's brought out their Shamrock Shakes around St. Patrick's Day. The past couple of years I haven't been able to have it because of the dairy, so I was thrilled when I found this copycat recipe! Just use the soy ingredients to make it dairy-free...."