Flaps, gear, condition levers, autofeather. Stuff that pertains to flying slow, landing, stopping (or going around as the case may be), and going around.
Before Landing in the Twin Bonanza is—
Landing Gear - DOWN, IN, GREEN
Fuel Pumps - ON
Flaps - (___), OFF, SET
Prop Levers - (___) RPM
Incidentally, the only thing that really, really matters in all that is "Is the gear down, stupid? Are you sure you put the gear down, stupid? Really seriously make sure the gear is down, stupid!"
It's not necessary to move the prop lever(s) to go-around RPM in most normally-aspirated, reciprocating engines airplane unless you're actually going to go around, or you have a really serious reason to think you will. It makes a lot of racket in a lot of cases and does you very little good unless you wait to do it until things are below the governing range. (Pet peeve.)
Save the people, save the airplane, save the power plant, save the mission, in that order.
As much as I love the personal sled, I regard it much like the airplane I fly at work: if need be, it'll be sacrificed to protect the lives of those on board.
Note that saying "DOWN, IN, THREE WELDED" is an appropriate response if someone says "landing gear" in a fixed-gear airplane.

Or "Prop? Yup, still running."
And it's not a jet, please don't fly B-29 patterns either. I guess it's good for getting to 1500, though.
Yes, because the lawyers that wrote the operating instructions for the various Cessna singles really have a great understanding of how the airplane operates. Like setting the elevator trim to takeoff, then unsetting it with the manual electric pitch trim check. (This phenomenon actually observed on recent Cessna singles.)
I also realize that we're talking about Before Landing and not Before Takeoff here, but my point is that the POH is decidedly non-regulatory (or even proofread) outside of Limitations and Performance (incorporated by reference).
I'm not arguing that you ignore it wholesale outside of Sec. 2, but folks need to realize that a general aviation POH outside of Limits is a starting point, and not the word of the Almighty on how you
WILL operate the airplane.
The fact that the 172/182 modern Normal Checklist is in the tens of pages (ish) misses the point of a checklist. Checklists are for killer items, and must be short, sweet, and to the point in order to be usable. Otherwise, once you're off the ground, the little binder has a tendency to wind up somewhere on the floor or in the document holder. *shrugs*
(It's also a "check" list, not a "do" list.)
Short, sweet, sensible, and standardized.