I had the Wacoan and it was awesome. They have a dedicated grill for GF sandwiches too.
They can do all of their sandwiches GF and have a separate grill. They are delicious. We had The Boss and The Guac one.
Unfortunately I couldn't try this place due to them being out of gluten free bread. Kind of sucks they don't always have it on hand.
Ordered 2 gf grilled cheese sandwiches (the boss & guac this way), and was informed that they have a separate grill for allergy orders! They were both very tasty and we will definitely be back next time we come to Magnolia Market. *Dairy-free cheese available.
At Magnolia Silos