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I would think the flour and milk/cream will turn it to a paste. Why not cook it the day before 80% of the way, then just pop in the oven to finish and crisp before serving.
This has been asked a few times lately for scalloped and gratin potatoes. You run the risk of potatoes poking out of the liquid and they'd turn grey/black. bigpan give the best option to cook partially. When you store it, press plastic wrap directly onto the completely cooled dish.
This will turn into a nasty mush if you try to leave it for 24 hours. Best option is, as previously suggested, par-bake it, then cool, cover and finish off later.
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Well played. You deserve a cookie.
Bonus: It's dairy-free, too.
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