Free cookie with entrée at Potbelly!

Potbelly is offering a free cookie with an entrée purchase at participating U.S. locations from 9/21 to 9/27. The deal is available for one free cookie with sandwiches, salads, or bowls of soup when you buy an entrée, which normally costs $28. Limit one per customer. The offer is exclusive to Perks members and will be active during the specified dates. While the offer adds value with a free treat, the overall deal is limited in scope and time, and the current price point of $28 suggests this is more of a promotional perk than a significant discount.