Panama City, Fla. — Slim Chickens, a leading fast-casual franchise which features dine-in and drive-through in the “better chicken” segment, plans to open its first location in Florida in the spring. The forthcoming restaurant, which will be in Panama City, comes out of the brand’s recent 10-unit franchise agreement covering the Florida Panhandle. There will also be a location coming to the Callaway area. Chris and Amy McMillan, along with business partners Richard Maddox, Adam Cantrell and Becky Retherford, are bringing Slim Chickens to the region and are all local …