This is a traditional bakery with locations throughout the Atlanta area (see their website below for locations, phone numbers, etc), but Piece of Cake Bakery also stocks Pure Knead products at every location, according to the company.
You should be able to find Pure Knead cupcakes and chocolate chip cookies in dedicated freezers at Piece of Cake Bakery shops. These Pure Knead products are vegan, gluten free and made free from the Top 8 Allergens. Pure Knead also sells gluten-free, allergy-friendly bread via grocery stores in the area.
Beyond the Pure Knead products, it does not appear that Piece of Cake Bakery takes special diet requests for orders, but they may be able to accommodate if severe allergies are not a concern. Contact your local shop directly to inquire.