Minimal Web API code helper package

Folks, a couple of weeks ago I was watching a video where someone used a NuGet package in a minimal Web API project to change the plumbing slightly so that it was easier to code the endpoint methods. By default, the endpoint methods must be strictly coded and it's tricky to break them apart or make partial methods. The package I saw added some magic to make coding the endpoints easier, but I can't remember exactly how. I just remember thinking "that looks handy" and now I can't find it. Any idea what it might have been? *Greg Keogh*