McDonald's brought back the Grimace shake vibes but made it BETTER! 💜🎂 This birthday cake McFlurry has chunks of actual cake, rainbow sprinkles, and that mysterious purple flavor that somehow works. It's giving major birthday party nostalgia and I'm not mad about it. Way better than regular vanilla.
Add the vanilla ice milk, birthday cake flavored syrup, salt, and vanilla extract to a chilled mixing bowl. Blend until just combined and thick — ice milk is key for McDonald's signature McFlurry texture (thicker than soft serve, not real ice cream).
Fold in small cubes of yellow cake and half of the rainbow sprinkles. Cake chunks should be approx. ½-inch for authentic McDonald's mix-in bite.
Add purple food coloring to the base mixture and gently pulse in the blender until evenly colored. 'Copycat tip': Use purple food coloring to match Grimace's signature shade without overwhelming the flavor.
Spoon the blended McFlurry base into four serving cups. Swirl in whipped topping for McDonald's-style creamy finish.
Top each portion with remaining rainbow sprinkles and extra cake cubes. Serve immediately for optimal soft, fluffy texture — McDonald's McFlurry is best when just blended and not frozen solid.