Arms, a week ago. Not sure I'd recommend it at $60, honestly, but I knew what I was getting in to. Mainly bought it for local multiplayer, and it's fun for that.
Actually the three before that were Switch games, too: D5, MK8 Deluxe, and Zelda. The one before that was Horizon. And the one before that was... probably in 2016? I don't actually remember. Possibly The Last Guardian.