I vaguelly recall reading a manga/webtoon. It went something along these lines:
FL transmigrated into a story. She didn’t like the og ml, a scumbag or useless trash or something, who was her fiancé or would soon be in a relationship with her character. To be rid of him she went to look for the og fl but when she was found it turned out she had already married a handsome childhood friend and they were running a business together, I think it was a bakery. FL suspected she was most likely also a transmigrator/reincarnator.

This is about all I can recall. If anyone knows which story this is, please let me know.

I was looking for that one as well and yes she was a transmigrator, and she opened a bento store with supposed husband. Let me know if anyone finds the title please.