As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, FLIGHT ATTENDANT REPORTED FIRE IN AFT GALLEY OVEN AND ECAM MESSAGE SMOKE LAVATORY SMOKE WAS RECEIVED. FIRE EXTINGUISHER WAS USED TO PUT OUT THE FIRE AND THE AIRCRAFT RETURNED TO ORIGINATING FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE INSTALLED MISSING GUARD IN OVEN, CHECKED OK.