

FYI “darling” can also be used with a spouse or romantic partner. Your husband or girlfriend can be your “darling” just like “honey” or “baby”. It has a similar meaning in this case, where “darling of the group” means everyone really likes them, even if not sexual/romantic.
And this use, “darling of the ____”, is a slightly older, but relatively common, saying.
It feels like Taco Bell has a long history of this. My first thought was how as a kid my local one also sold Choco Tacos, and it felt right.
But then I realized the true answer for me was I hate their change in sauce for the Cheesy Gordita Crunch. Instead of the Baja sauce they used to have, a while back they switched over to using a ranch sauce. (Gotta fulfill that stereotype of Taco Bell just being a dozen ingredients in different shapes/amounts.) That sucks.