The McDonaldland Shake, also known as the Mt. McDonaldland Shake, has a flavor profile described as a blend of McDonald's iconic creamy vanilla soft serve with raspberry-flavored syrup. Many reviewers and tasters have likened the taste to a creamy, dreamy version of blue raspberry, with nostalgic fruity berry-forward notes reminiscent of popular candies from the '90s. The shake has a vibrant blue color topped with pink whipped cream, reflecting the visual theme of the Mt. McDonaldland volcano from the McDonaldland universe. Some specific flavor descriptions include:

• A mix of vanilla soft serve and raspberry syrup.
• A taste similar to blue raspberry slushies.
• Notes reminiscent of raspberry, blueberry, and other berry flavors.
• A nostalgic, slightly artificial blue raspberry candy flavor popular in the '90s and early 2000s.
• The pink whipped cream tastes like standard whipped cream, possibly with a faint hint of bubblegum.

Overall, the Mt. McDonaldland Shake is berry-flavored, predominantly raspberry (blue raspberry), blended with creamy vanilla soft serve for a sweet, nostalgic treat.