On 9 February 2023, a Boeing 777-200ER was en-route near Marseille when the cabin crew observed smoke coming from a rear galley oven which was spreading into the rear passenger cabin. After an immediate initial response and use of multiple Halon Fire extinguishers, the smoke ceased after about 20 minutes but the fumes remained. Although this meant no ongoing emergency existed, some cabin crew and passengers had experienced breathing difficulties and it was decided to return to Amsterdam. The cabin crew response to the situation was subsequently assessed as contrary to applicable procedures and relevant cabin crew training seemingly inadequate.