A cooking appliance, as provided herein, may include a cabinet, a heating element, a first false wall, a second false wall, and a spit rod. The cabinet may define a cooking chamber. The cooking chamber may extend along a lateral direction between a first chamber side and a second chamber side. The heating element may be mounted within the cabinet. The first false wall may be slidably positioned within the cooking chamber at the first chamber side. The second false wall may be slidably positioned within the cooking chamber at the second chamber side. The spit rod may define a rotation axis from a first rod end to a second rod. The first rod end may be attached to the first false wall to slide therewith. The second rod end may be attached to the second false wall to slide therewith.