McDonald's is bringing back its popular Shamrock Shake and introducing a new Oreo Shamrock McFlurry. The Shamrock Shake is made with vanilla soft serve and minty Shamrock syrup, topped with whipped cream. The Oreo Shamrock McFlurry features vanilla soft serve, Shamrock syrup, and Oreo cookie pieces. Prices vary, with a Los Angeles location charging $4.39 for a medium Shamrock Shake and $4.59 for a regular Oreo Shamrock McFlurry.