A toaster oven has a sheet metal chassis and plastic, cool-wall support walls which support the chassis. Both a pivotally-mounted bottom panel and a slidable crumb tray may be provided. Parts of the chassis are connected together without the use of fasteners or welds by twist tabs. A sheet metal top panel and, optionally, a plastic top panel extend over the top of the chassis. One of the support walls has a pair of locking pins and the plastic top wall has a forwardly-facing hook engaged with one of said locking pins and a rearwardly-facing hook engaged with the other of said locking pins. Support pads on the inner faces of the plastic support walls may cooperate with mounting members for supporting the toaster oven on the bottom of a kitchen cabinet. A control compartment beside the oven chamber houses electrical controls including a heat sensing thermistor mounted in a porcelain tube held against the wall that separates the control compartment from the oven chamber.