If you’d like to double down on your diner-style treat, try adding malted milk powder to your vanilla milkshake, turning it ...

thinking through which punchy addition you are going to pour into your creamy old-fashioned vanilla milkshake recipe can make or break the decision to turn your recipe into an alcoholic one.

In addition to Shake Shack's signature Angus beef burgers, crispy chicken sandwiches, french fries and hand-spun milkshakes, the Boston airport location is now serving alcohol at the Shake Shack Bar.