I'm finding switch expressions filling that gap a lot lately. I've also picked up at some point a bad habit in "borrowing" JS' ugly IIFE pattern in C#.

    var x = (() =>
    {
      var z = whatever;
      ...
      return value;
    })();

It is not the most performant way to write that code and if the contents start to get long, refactoring to its own method starts to feel more likely, but in one-off cases, it seems fine for how ugly it is.