If I have something going in the oven, I put the shells on a piece of foil and put them in with it. If not, I turn the oven temp to 200, and when it gets there, turn it off and let the shells stay in until I'm ready to take them out. them I just crush them and put them in a plastic container in the shed with their food so I can grab some whenever I feed them. In summer/fall, I use my food dehydrator because it is up here.