Very well
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Parched corn, let's call it PC for the sake of this thread, is, as stated, the only survival food you really need until you can get to a more balanced diet.
It has the best proportion of long term energy vs short term "pow!" than any other food I've come across. It is natural, and as such the carbs and sugars won't play with your blood sugar anywhere near like a processed bar or M&M laced "trail mix" will. This is a consideration for me as I have been a Type I diabetic for the last 45 years. For instances when I need that sugar jolt due to unforseen factors, I have Mexican chocolate that fits the bill and stays within my historical period. But, with due diligence PC can fulfill my usual needs. Much more so a "normal" person.
The preparation is simple; dry the kernels, then parch (roast, toast, etc) them in a pan until they fill out. Now is the time where I'd add a bit of salt (when hot).
I wait until the weather is cooperative for drying all my stuff; corn, vegetables, meat, etc. This would be on days where the surface of the tray or just the direct sun itself is too hot for flies or birds to molest my project. In cooler climates, an oven on low and cracked open or even over a radiator would work. Keep the kernels moved around occasionally to prevent sticking and ensure full drying. All the while, try to keep your depth very thin to also speed the drying.
When dry, as tombear also said, I heat a cast iron pan and lightly wipe with a bit of oil. Just enough to make it shiny is about right. Put enough kernels to cover the bottom and shake or spin constantly until the kernels aren't wrinkly anymore. It goes fast, so be watchful. While hot, I add salt. I guess it helps as a preservative to some degree, but mostly it's for taste.
I try and store any dried stuff, PC included, that I intend to use within a couplethree weeks in cotton, muslin, or linen sacks to let it breathe. Any longer and it gets hard (vegetables start darkening and lose flavor). For longer storage, paper sacks and even (gasp) zip lock bags. Check for mold if stored a long while.
You can pop small handfuls of PC in your mouth, chew and swallow like dried nuts only crunchier. Each kernel does have a smallish air pocket, so you can further compactify (my word) it by smashing a bit. Ground cornmeal is not PC, and ground PC might not be all that fun to have a mouthful of without plenty of water.
The Eastern Woodland Indians made tubelike belts that tied around their waists to carry their PC in. Traveling fast. On foot through those forests, they could grab a handful of PC at the run then dip a hand in the very common streams for a swig of water to wash it down....all at the run.
Hope this helps.
so corn has become something of a staple. Some of the grades are truly awful to try to eat….white cornmeal for instance. I tried every damned thing I could think of to make that edible. In the end I threw it out to the pigeons and it took those greedy gannets three days to eat it 
yet golden cornmeal I use a lot, and I recently managed to buy masa haring and it's brilliant 
