Thank you all for discovering and testing this great method!
I have a question for those who might know. If you don’t have an insulated cookie sheet, can you do one of the following:
> Put two half-sheet jelly roll pans together (stacked normally) OR
> Put two half-sheet jelly roll pans together (facing each other so there’s a big space inside) OR
> Take a jelly roll pan and put an unrimmed cookie sheet on top of it (but it doesn’t cover the entire jelly roll pan
Thanks to anyone who knows if one of these is an equivalent!