Kat at King Arthur January 21, 2021 at 9:25am In reply to What I need to figure out is… by Vince (not verified) Hi, Vince! A 15x21 inch pan has 1.5 times the area of a 17x12 inch pan, so you can just use that as your ingredient multiplier. Happy baking! Reply
January 21, 2021 at 9:25am
In reply to What I need to figure out is… by Vince (not verified)
Hi, Vince! A 15x21 inch pan has 1.5 times the area of a 17x12 inch pan, so you can just use that as your ingredient multiplier. Happy baking!