Can green bean casserole be made the day before serving?

Certainly, but then when it is served you should call it leftovers. Green Bean Casserole, like many items will obtain a different consistency if cooked then cooled, then heated again. If you want to make the casserole ahead of time then don't bake it until just before you want to eat it.

This consistency would be very close to making it just before you eat it.

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