This fried chicken is among my arsenal of crowd-pleasers. In my experience, deep frying is a great technique when you're cooking for a lot of people, since it's probably the fastest way to cook something.
This is Joshua Weissman's "American Fried Chicken" recipe with a few minor tweaks.
This can be made without MSG. But if you're omitting it because you don't expect to be able to find it: you can almost certainly find it locally, assuming you live in the United States. The brand you'll find in ordinary American supermarkets is Ac'cent Flavor Enhancer. It's going to be in the aisle that seasonings are in, probably not far from the salt. If you have an Asian grocery store nearby like an H-Mart, I would recommend stopping there and buying a giant bag of Ajinomoto because it's much more economical.
I hate wasting the buttermilk, so I usually re-purpose it for whatever side dish I'm serving alongside the fried chicken. I've successfully used it as the liquid for a baked mac and cheese, for grits, and for cornbread. That's what I do, because of my aversion to wasting dairy or meat. My younger brother apparently freezes his buttermilk marinade and re-uses it for later batches of fried chicken to great success, so that's also an option. You can also just dump it.
This reheats perfectly in an air fryer.
You can save the oil and re-use it for another batch or two of fried chicken, or some other fried dish. Discard when it starts to smell off. If you're re-using oil, be mindful of what's been cooked in it beforehand. I keep a separate jugs of recycled oil for fish, and things besides fish. Chicken fried in oil that was previously used for fish is nasty.