With an established Texas presence, strong brand recognition and market potential, Potbelly Sandwich Works believes now is the time for further franchise expansion in Houston and surrounding areas. Since opening its first location in Chicago in 1977, the neighborhood sandwich shop has served guests with warm, toasty sandwiches, signature salads, hand-dipped shakes, and other fresh menu items. Following the launch of its Franchise Growth Acceleration Initiative, Potbelly has now grown to more than…