An oven appliance includes a baking stone positioned within a housing at a bottom portion of a cooking chamber. A baffle is positioned within the housing below a lower heating element array. The baffle includes an upper plate and a lower plate. Holes of the upper plate are offset from holes of the lower plate. The holes of the lower plate are contiguous with a regulating air duct of the housing such that a flow of air enters the baffle through the holes of the lower plate. Regulating air exits the holes of the upper plate and is impinged onto a bottom surface of the baking stone in a pattern to regulate baking stone temperature.