The recipe stayed the same from 11 years ago. It has passed multiple rounds of recipe testing. When people say cookies spread, it’s most likely because they used a thin, dark metal baking sheet. And, usually, people’s ovens aren’t calibrated and are baking at much higher temperatures than they think. Following this recipe will yield great results :)

I tried it with more flour and yeah, it spread for me too. Good as a sugar
cookie though.