I’d start with the World of the White Rat. There are a couple connected books that all exist in the larger world but while they are internally referential occasionally, they aren’t all sequels. My first was Paladin’s Grace, and I find that to be a great start. I don’t know if I’d call it romantasy, but it is definitely a fantasy with a romance sub plot that is important to the whole story. The big picture for that particular series is: “What do you do if you’re Paladin for a god that dies and how do you cope?”
If you want to try something that’s a one off, Nettle & Bone is good.
If you want a short story, A Wizards Guide to Defensive Baking