To provide the subject food significantly increased in the deliciousness peculiar to Cortinellus shiitake to be afforded with the good taste or flavor peculiar to Cortinellus shiitake with a small amount thereof added, and eatable tastily either directly or after processed.

This method for producing Cortinellus shiitake processed food comprises the following two steps: (1) raw Cortinellus shiitake or dried Cortinellus shiitake after reconstituted with water is mashed into Cortinellus shiitake paste, or water is added to powder obtained by grinding dried Cortinellus shiitake to form into Cortinellus shiitake paste; and (2) the Cortinellus shiitake paste thus obtained is packed in a closed chamber 2 and heated at ≥90°C in the chamber 2 to form into a heat-treated paste as the objective food.