. I think the marshmallows were old but I didn't think that would matter. It turned in to a solid blob on the bottom of the pan. Thinking that was the way it was supposed to be I dumped it over the Rice Krispies and smashed it into the pan. The result was a dry, rock hard atrocity that the dog wouldn't even eat. It went straight in to the trash and we went out and bought a box of them already made. Much better and way simpler!