Barbara, your approach sounds very precise and clean, which is something we certainly appreciate! We find that having parchment on the two longest sides of the pans (if rectangular) tends to provide enough coverage and support to safely transfer the baked goods. Plus, making mitered edges isn't something that all bakers want to take time doing. That being said, we encourage you to use whatever method works best for you! Kye@KAF
April 9, 2017 at 2:31pm
In reply to I haven't tried a sling; most of my bar cookies are baked in 9 … by Barbara (not verified)