Ben Affleck and Jennifer Lopez hit up the annual Malibu Chili Cook-Off Sunday, and try as they might … they walked away empty-handed after a game of hoops.

The newly-blended fam were all the buzz at the shindig … with twins Max and Emme in tow — and they stopped at the hoops game. Ben’s a sports nut, so you’d think he might score a basket or even 2, but he tried 4 times, fully suffering from empty net syndrome.

J Lo stepped in, and although she’s a triple threat with singing, dancing and acting, she shot her shot 3 times and failed.

They’re back from their second honeymoon, and getting back to “normal” life by going to a carnival in the sweltering L.A. heat … 100 degrees plus in many areas, and Malibu was no exception.

The Cook-Off is a tradition in the Bu … attracting Tom Hanks and Rita Wilson, Patrick Schwarzenegger, Johnny Knoxville, Donald Faison, Jack Osbourne, Evan Ross, Lana Del Rey and Amanda Bynes.

The Kardashians represented with Psalm, Chicago and True … looks like Khloe brought them and was hanging on the beach with the brood, including North.