Mommyme1...why do you bake your challah in tins? Just shape and place on a cookie sheet/baking sheet. The only challot I ever made in tins were the "Keter Torah" ones for Shavuot. Even the bakery doesn't use tins!
I guess because that's what I'm used to. It doesn't cost me though because as I said the tins last for years - even the disposable ones.