DARE has "druther" from 1887 and "druthers" from 1895. RHHDAS has

"druthers" from 1870.

This is from September 1833, pg. 40:

I'd _druther_ live in the woods any time, by myself, than on the best

plantation in the county; though I've got a family, and a decent one, too.

MARIAH CAREY: I hate my druthers!

POPIK: That's "brothers," Maria.

MARIAH CAREY: That's Mariah!