In reference to the cornbread recipe suggestion for "Monday" thanksgiving prep
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To my knowledge, regular cornmeal is ground finer than polenta corn meal. Not sure how the polenta corn meal would fare in a cornbread, but I could imagine it may be a bit too grainy!
Polenta is a very coarse grind. Your cornbread will be very "rustic" if not outwardly crunchy. Polenta needs more liquid and time to cook through.