when i'm using my cookie sheet, when it reaches about 300, there's a loud, startling bang and the cookie sheet goes twisted with two sides up and two down.
I'm using it to roast chicken now and all the grease is going to one side. This cookie sheet I thought was heavy duty at $20.
What can I buy that won't do this and stay flat and level?
Is there a cookie sheet that won't do this?
Thanks for any advise.