As I was walking through the market, I asked around to see if there was anything gluten free there. A few employees told me about a bakery toward the back of the market. I immediately headed that way and found Flying Monkey Bakery. They sell flourless chocolate cake, cookies, and macaroons. While the sign only advertised 'flourless', I talked with one of the employees and he confirmed that they are in fact gluten free.
I opted to try the macaroon and chocolate cake.
In my opinion, Flying Monkey Bakery is a little overpriced for the size and quality of the product, but when options are limited, you go with what you can find. Thankfully, the guy gave me a discount. Holla. Both desserts were good but I definitely preferred the chocolate cake!
There is also a PA General Store in the market that has lots of touristy items, but if you look hard enough, you'll find some gluten free treats hidden in the back. Keep your eyes peeled at all times, you never know what you'll find.
As I said before, I'm sure there are more gluten free options at Reading Market but this is just what I stumbled upon during my last trip. Next time I'm there, I'll let you know if I find anything else. And as always, if you've been to Philly and know of any gluten free places to eat, let me know! I would love to try them next time I'm in the area!