A temperature-regulating appliance includes a top portion, a base, and a mounting adapter. The top portion has an upper surface and a lower surface. The top portion is configured to be mounted to a countertop. The base includes a housing defining an internal compartment and a thermal element disposed within the internal compartment of the housing. The mounting adapter extends from the lower surface of the top portion to the housing. The mounting adapter detachably couples the base to the top portion.