Emilie, food safety experts would tell you to store the bars in the fridge as soon as you've iced them, or within a couple of hours. Make sure you cover them tightly, as refrigeration can make them dry out; I wouldn't leave them longer than a couple of days in the fridge, as all the time they're in there they're gradually deteriorating, freshness-wise. Fine to sprinkle with nuts just before serving, although I made these last weekend, sprinkled with nuts immediately, refrigerated overnight and served the next day — and I really couldn't detect any problems with the nuts having become potentially soggy. Enjoy - PJH

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