I make sweetened roasted nuts by tossing them with a melted butter, brown sugar and salt mixture, then roasting for about 10 minutes at 350. I have only made them for myself and stored them in the refrigerator. I want to make some for Christmas gifts. Can they be stored at room temp. and if so, for how long? Or, if not, do you have a recipe that's similar, and safe at room temp? Thanks!