Joey Chestnut -- EATS 384 GYOZAS ... Sets New World Record

Joey Chestnut has reclaimed his title as KING OF THE GYOZAS ... eating 384 of the dumplings in 10 minutes this weekend ... shattering the world record.

TMZ Sports has the footage ... showing the legendary competitive eater dominating reigning gyoza-eating champ Matt Stonie ... who put down 377 potstickers at the Day-Lee Foods World Gyoza Eating Championships in L.A.

It's a HUGE improvement for both Chestnut and 22-year-old Stonie -- who fell way short of 300 when they battled last year.

After the competition, Chestnut told us he KNEW he was gonna crush the record ... but didn't expect Stonie to finish so close.

"A win's a win though."

Next up for Chestnut -- the World Rip Eating Championships at the Nugget in Sparks, NV ... where he'll try to defend his title for the 5TH straight year!