This method for producing a packaged food product portion includes the following steps: providing a cup defining an inner area for receiving the food product； cold pouring, at a temperature below 50° C., the food product into the receiving area of the cup； covering the food product using a thermally insulating lid arranged such that thermally conducting flaps of the cup extend toward the outside of the lid after the covering step； folding the flaps on an outer face of the lid opposite the receiving area； and heat-sealing the flaps on the outer face.
