Looking for a quick reading fix makes total sense, but I feel like people sleep on novellas too often. A true one-shot that sticks with you is something like Ted Chiang's 'Exhalation'. The whole collection is brilliant, but the title story is this perfectly contained, mind-bending piece of speculative fiction you can read in under an hour. It packs more ideas into 30 pages than some doorstopper novels manage in 600.
For a different vibe, I’ve been getting into classic sci-fi mags. There are archives online full of golden age short stories from 'Analog' or 'Galaxy'. They’re designed to be consumed in one sitting, with a clear premise and a twist. Something like 'The Cold Equations' by Tom Godwin, though that one’s a real punch to the gut. Not exactly a cheerful pick-me-up, but unforgettable.
Lately, my quick fix has been literary journals like 'The Paris Review' or 'Granta'. You discover authors you’d never find otherwise, and the commitment is just a few pages. It’s less about finding a specific famous title and more about the surprise of stumbling on a perfect, tiny story about something mundane that suddenly feels huge. That’s the real magic of the one-shot format for me.