Abstract: A mixing bowl with protuberances one the outer surface of the side wall of the bowl. A first mixing bowl has a diameter greater than a second mixing bowl. The two bowls form a mixing bowl assembly wherein the protuberances of the inner bowl contact and abut the inner surface of the outer bowl to define a clearance gap between the two bowls, wherein if the bowls cool at different rates after being washed, the mixing bowls are not jammed together. Each protuberance extends outwardly about one-fourth inch and the gap defined between the bowls has a clearance dimension of about one-fourth inch. The inner bowl has three or four protuberances and the outer bowl has four protuberances. The mixing bowls are made of stainless steel.