I've seen this Michelin Guide Bib Gourmand category mentioned a few times recently in Thai social media...
https://guide.michelin.com/th/en/ban...nce&order=desc
(filtered for Bangkok only)
For anyone who likes Bak Kuh Teh, and can't get to Singapore, Song Fa has opened a branch here. Central World Level 3, just next to the Zen Dept. Store side.