doubling a recipe without ruining it

learned most of this the hard way, mostly in a 9x13 pan

01
Match the pan to the new volume before anything else
doubled brownie batter into the same 9x13 once and got gray edges with a raw middle, needed a bigger pan or two pans
02
Brown meat in batches, don't double it in one pan
crowd the pan and you're steaming, not searing
03
Salt and acid go in at the very end, not doubled upfront
soy sauce and fish sauce especially don't scale 1:1. your tongue is the real measuring cup here
04
Aromatics and chile scale to about 1.5x, not 2x
05
Go easy on the leavening in doubled baked goods
doubling baking soda exactly can leave a soapy edge in a bigger cake. found this out with a very flat, very metallic attempt
06
Add time in small increments, not double the clock
a doubled braise needs more time but nowhere close to 2x, the pot's just deeper
07
Fold or whisk longer, the bigger the batch
08
Taste the sauce before the pasta goes in, not after
09
Chill doubled cookie dough a bit longer before it bakes
an extra 15-20 min in the fridge or it spreads more than usual
10
Write the doubled amounts down before you start (double it)
your mid-cook memory is not to be trusted, i've added the flour twice more than once