Place the metal bowl of your stand mixer in the freezer for 10 minutes. If you don't have a metal bowl with your stand mixer, skip this step. Placing the bowl in the freezer will help maintain the creamy texture of a blizzard.
While the bowl is in the freezer crush the Twix bar into small chunks. Don't break them into too tiny of pieces.
Remove the bowl from the freezer and re-attach to your stand mixer. Add the vanilla ice cream and mix with the the stand mixer paddle until smooth and creamy.
Add the broken Twix Bar and mix until well incorporated. Spoon into a cup and enjoy immediately.