Abstract: An add-on expansion module is provided that can be used with existing cooking appliances in order to allow the cooking appliance to perform multiple cooking functions. The module is designed to fit on top of a cooking appliance's vessel, with the cooking appliance's lid able to fit on the module. Therefore, the module does not require an additional lid to store. The module includes a support structure that may include one or more housings in which cooking accessories may be retained. The cooking accessories may carry out many cooking functions, including steam, air fry, smoke, sous vide, timed ingredient add, and food processor functions. The module further includes two openings that allow a user to access the contents of the vessel during the cooking process, for example to add or stir ingredients, without having to remove the module.