Rocky Hill Ranch Mountain Bike Trail in Smithville used to make the firebird til their restaurant closed grilled chicken, guacamole, mayo, serranos, lettuce, onions, pickles, tomatoes best I ever had (grilled chicken sandwich that is ) haven't found a grilled chicken sandwich I'm nuts about in Austin yet not hard to grill in the backyard though
It sounds odd, but El Arroyo makes a good chicken sammich. They use Kolache bread , so it's kinda sweet.
I had a great grilled chicken sammich at Dirty's on the drag yesterday for lunch. Home of the Dirty girls (my favorite kind!) Greasy. With mayo. On a toasted bun. Only possible improvements could be guacamole and serrano peppers. I'm sure you can get them to hold the mayo if that's your fancy.
Had me one of them El Arroyo (Wood Hollow & Far West next to Bert's BarBQ) grilled chicken burger + guacamole + serrano peppers today. Yum!
Trudy's has my favorite. Whole wheat bun, avocado and chipotle mayo. Add their wedge fries and a bit queso and it's heaven.