EDIT MAY 26 2018:
I’ve been here twice since the announcement and they still have the Gluten Free Breakfast Sandwich. Not sure when they will run out though.
EDIT MAY 2018:
Gluten free breakfast sandwich discontinued. Thanks for nothing Starbucks.
Original review below-
Starbucks has a new gluten free breakfast sandwich, which is made in a certified GF space. What you get is pretty much a ham/egg/cheese tiny sandwich sealed up in a steam pouch of some kind. I believe Chuck E. Cheese does this same thing with personal pizzas. So you can be assured it's safe for people with celiac. They probably just throw it in the microwave, but it's kind of tasty. I can't it Dunkin Donuts breakfast items so I don't have much to compare it to, but from my perspective it's on par with a frozen Udi's breakfast sandwich. Good when you need something on the go, but not amazing. You can buy a box of the Udi's for less money.