FLT ATTENDANT RPT; S80; MIA-YUL; GALLEY FIRE AND SMOKE. CAPT DECLARED EMER. RETURN TO MIA. FLT CANCELED. BROKEN OVEN THERMOSTAT WAS CAUSE.

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5 MINS AFTER TKOF; #2 FLT ATTENDANT (FORWARD FACING JUMP SEAT AT TAILCONE EXIT) WAS POINTING TO SOMETHING OVER MY HEAD -- A BIN HAD POPPED OPEN BEHIND ME. I GOT UP; CLOSED IT; TURNED TO SIT; NOTICED #2 FLT ATTENDANT STILL INDICATING SOMETHING OVER MY HEAD. AT THE SAME TIME I NOTICED SMOKE COMING FROM THE OVEN ACROSS FROM MY JUMP SEAT. I TURNED THE OVEN OFF; SMOKE DIDN'T DISSIPATE. WENT BACK TO #2 FLT ATTENDANT'S JUMP SEAT. SHE CALLED COCKPIT AND #1 FLT ATTENDANT. I RETRIEVED HALON FROM BEHIND LAST ROW OF SEATS. OUR PROCS STATE THAT WE NEVER OPEN AN OVEN DOOR IF AN OVEN FIRE IS SUSPECTED. #2 FLT ATTENDANT GOT SAFETY MANUAL OUT TO DOUBLECHK PROCS. I WENT BACK TO OVEN; STILL SMOKING. FELT DOOR AND LOCKING MECHANISM -- BOTH EXTREMELY HOT; VERY ABNORMAL. PULLED ALL CIRCUIT BREAKERS TO OVEN. COCKPIT CALLED; I UPDATED THEM ON SIT. THEY INFORMED US AN EMER WOULD BE DECLARED AND WE WOULD RETURN TO MIA. NO TIME FOR PLANNED EMER PROCS. PREPARED CABIN FOR LNDG; RETURNED TO JUMP SEAT WITH HALON. AFTER LNDG; SMOKE HAD BEGUN TO DISSIPATE. COCKPIT TAXIED TO GATE; FIRE CREW BOARDED THROUGH AFT STAIRS. THEY OPENED OVEN; ALL FOOD INSIDE WAS BLACK; BUT NO FLAMES AND NO MORE SMOKE. THEY CHKED OVEN AND INSULATION IN CEILING FOR DAMAGE AND FOUND NONE. THE PAX WERE DEPLANED DURING THIS TIME AND MAINT BOARDED TO INSPECT OVEN. THE OVEN WAS FULL OF ENTREES AND SET FOR 275 DEGS. NORMAL COOKING TIME FOR A FULLY LOADED OVEN AT THAT TEMP IS AT LEAST 30 MINS. OVENS WERE TURNED ON 5 MINS BEFORE TKOF AND SMOKE WAS NOTICED 5 MINS AFTER TKOF; AT WHICH TIME OVEN WAS TURNED OFF. MAINT CONCLUDED THE THERMOSTAT ON THE OVEN WAS BROKEN AND TEMPS WEREN'T REGULATED CAUSING THE OVEN TO HEAT TO VERY HIGH TEMPS IN A SHORT AMOUNT OF TIME. THE OVEN WAS REMOVED FROM THE ACFT. THE FLT WAS RESCHEDULED FOR THE FOLLOWING MORNING BECAUSE THE COCKPIT CREW WOULD HAVE BEEN ILLEGAL TO CONTINUE.