Things You'll Need
Popcorn is actually a bunch of corn kernels that have puffed out after being heated up. The popcorn is crispy and light, making it great for serving as a snack food. Butter, salt and other flavorings can easily be added to the popcorn. If all of the popcorn is not eaten within an hour or two, it starts to turn stale. The popcorn does not have to be thrown away; it can be made crispy again.
Preheat your oven to 350 degrees F.
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Remove your popcorn from the bag and lay it in a single layer a cookie sheet. You are going to bake the moisture out of the popcorn so that it will be crispy again.
Place the cookie sheet in the oven after it has reached the desired temperature, and then turn the heat off.
Wait five minutes and check to see if your popcorn is as crispy as you like it. If not, let it sit another two to three minutes. Any longer than 10 minutes may burn the popcorn.
Transfer the popcorn from the cookie sheet to a bowl and add butter and salt to taste.
This also works for stale biscuits or leftover pizza.
If you leave the oven on after you place the popcorn in it, you will remove too much moisture and the popcorn will burn.