An outer case for a cooking appliance is provided. An opening is formed in an external face plate of the outer case at a position corresponding to selected components of the cooking appliance. The opening is selectively covered with a cover plate so that the components may be selectively accessed through the opening, without removing the outer case. The cover plate may include extensions that are engaged in concave portions of the external face plate, with an opposite end of the cover plate being fastened to the external face plate by fasteners. The external face plate may also include a reinforcement bead and tool passing holes that allow a tool to pass therethrough without removing the external face plate.