Q:

How can I make my Oreos crispy again?

Someone1 didn't re-close the Oreo bag properly, and now the remaining cookies are kinda... not-quite-crispy. They're not soft, but they have this chewy side to their crunch.
If these were ordinary cookies, I'd pop them in the oven for a few minutes, but I have this thing where I like my creme filling to be inside my cookies, not melted all over the baking sheet. I'm funny that way.
Is there any way to make these cookies crispy again, or do I make the offending party2 eat this bag and get a new bag for, um, the non-offending parties?
If it makes any difference, these are peanut butter Oreos.
1: //shamefaced It was probably me.
2: hanging head in shame

A:

Put the bag in front of an air conditioner for a few minutes. Worked like a champ for Oreos and chips that went stale over a humid weekend in a desk drawer.
This was a window unit- I arranged to blow the cold air into the bag. Was amazed with the results.

A:

Since the problem is caused by the humidity absorbed by the cookies left opened, the solution would be to remove that water. Putting in an hoven at very low temperature could help the process but there's a risk of melting the inside.
Another option would be to use a dehumidifier. The problem with this solution is that usually this kind of appliance are supposed to suck humidity inside a room and thus it won't target specifically your cookies unless you manage to find a way to contain the target area. Maybe you could try with some small chemical dehumidifiers and seal them with the cookies in a bag for a while.
There are some options but ultimately if you think about it, are they really worth the effort just to clean your conscience :) ?
In my opinion you should just mark this lesson and use the cookies for another preparation like a milkshake as other suggested or a cake, afterall they're still absolutely edible.

A:

Preheat the oven to 300F. Scrape out the filling into a bowl. Put the cookies on an ungreased, filling side up in case there is still a bit of filling on the cookie. Bake for 5 minutes. The cookies will come out soft but that's okay. Let cookies cool completely. As they cool, they should harden. To reapply filling, heat filling in microwave in 5second intervals until filling is soft and pliable. (Stir filling each time, much as you would when melting chocolate.) Scoop filling into icing bag and pipe onto cookies. The filling solidifies quickly so work fast. If you melted the filling too much, wait a while before application.

