I did use a silicone sheet on rimmed cookie sheet. (epicurious.com)
Set up a shallow litter tray that the kittens can climb in and out of easily — like an aluminum one - use baking rimmed cookie sheet. (communityconcernforcats.org)
Cut spaghetti squash in half, place face down in baking dish or on rimmed cookie sheet with small amount of water (wellnessmama.com)