Is Overcooked! 2 crossplay?

Only on PC, and only if you switch to a beta branch.

Does Overcooked! 2 have split screen?

Yes. Overcooked! 2 supports split-screen local co-op on one machine.

Overcooked! 2 supports 1 to 4 players, and it can be played solo.

Four players, online or on the same couch.

Players	1–4
Crossplay	PC (Steam), PC (Epic Games Store)
Split screen	Yes
Platforms	PC (Windows, Steam), macOS, Linux, PC (GOG), PC (Epic Games Store), Nintendo Switch, Nintendo Switch 2, PlayStation 4, Xbox One, Blacknut (cloud)
Released	7 August 2018
Developer	Ghost Town Games Ltd. and Team17
Price	$24.99

Is Overcooked! 2 crossplay? — Only on PC, and only if you switch to a beta branch.
Does Overcooked! 2 have split screen? — Yes. Overcooked! 2 supports split-screen local co-op on one machine.