Abstract: A cooking appliance includes an internal support defining a cooking cavity. An upper wrapper is disposed above the internal support. A separator plate is disposed adjacent to the upper wrapper. A venting channel is defined between the separator plate and the upper wrapper. A chimney is coupled to the internal support and the upper wrapper. The chimney fluidly couples the cooking cavity and the venting channel. A venting assembly is coupled to the upper wrapper and includes an actuator and a cover. A controller is configured to activate the actuator to at least one of vertically and rotationally adjust the cover relative to a vent opening in the upper wrapper to control an amount of steam in the cooking cavity in response to a sensed humidity.