This paper reports a new processing strategy for manufacturing ceramic foams based on a steam chest molding and pyrolysis process. Silicon oxycarbide (SiOC) foams were fabricated from a polysiloxane-hollow microsphere blend using the newly developed process. During steam chest molding, the polysiloxane softened and the hollow microspheres expanded, resulting in a three-dimensional shape. During heat treatment, the microspheres decomposed and the polysiloxane transformed to an amorphous SiOC, resulting in SiOC foams with a porosity of 62%-81%.