Have your cotton candy flavoring and food coloring measured out and ready, since this shake comes together fast.
Add the ice cream, milk, cotton candy flavoring, food coloring, and salt to a blender.
Blend on high for 20–30 seconds until smooth and creamy, scraping down the sides if needed.
Taste and adjust — add more flavoring for a stronger cotton candy taste or more milk for a thinner consistency.
Pour into a chilled glass, top with whipped cream and a small tuft of cotton candy, and serve immediately.