The only Beatles song credited to all four is "Flying.

Magical Mystery Tour, side two.

It’s an instrumental jam they recorded in 1967. For whatever reason—maybe because it was collaborative and nobody wanted to argue over it—they gave the credit to all four: Lennon/McCartney/Harrison/Starkey. That never happened again on an original song.

“Carry That Weight” gets close, and “The End” features all four, but those are still Lennon-McCartney credits. If you’re playing Beatles trivia, “Flying” is the one.