I’ve found that the only way to get any kind of crunch on chicken, be it wings, thighs or a whole bird, is to cook at a high heat - at least 350°. The best chicken skin result I’ve had was on a whole chicken using a buttermilk brine for 24 hours before cooking, but I’ve never tried it with wings. For wings, I’ll dry brine for a few hours, put a VERY thin layer of olive oil on them, and mix my seasonings into some flour. The flour and oil seem to do the trick, but I also cook wings over direct heat, using a rotisserie and basket. They turn out great. Since I toss them in sauce after cooking, I don’t sweat crispness so much. I just want to bite through the skin so that it doesn’t pull off and burn my lips and chin!
The reverse sear technique is also used by a lot of people - cook low and finish over direct high heat - but I tend to cook wings in large quantities and I don’t like the time it takes to flip all those wings individually.
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