Abstract: A heat extraction assembly or apparatus includes a cooling cassette and a component coupled to a top surface of the cooling cassette. The cooling cassette may include an inlet, an outlet, and a cooling cavity disposed within the top surface of the cooling cassette. The cooling cavity may be in fluid communication with inlet and the outlet. The component may be coupled to the top surface of the cooling cassette proximate to the cooling cavity such that the component at least partially defines a boundary of the cooling cavity. Coolant flowing through the cooling cassette from the inlet to the outlet may directly contact the component at the cooling cavity in order to provide a cooling effect to regulate a temperature of the component.