An indexing or ratcheting conveyor configured to advance a load includes a frame defining the inlet end and the outlet end of the conveyor, a first device with a gravity rocking pushers and a powered member configured to advance the load in a direction from the inlet end to the outlet end of the conveyor. The conveyor can also include a second device configured to move the load, disposed at the outlet end only, in a direction from the outlet end to the inlet end prior to discharge of the load outwardly from the outlet end. The conveyor can be used as a component of an oven configured to cook or bake dough in containers with electrical resistance.