Mother-Hen-Michele
Crowing
Except if they figured out that if they act as a collective and boycott the food the human will panic and get something else. They don't like change towards something 'not quite' good enough (which happens when things are out of stock and you need to take the ' no-name' house brand. )Make sure you take away any extra treats when transitioning foods. Just like with children, when chickens are hungry they will eat what is put in front of them if they aren't given extra options.

But... Try explaining a supply chain issue to a bunch of cranky spoiled girls!

Yes, if you stand your ground @HollowOfWisps is right... you can be strong ... if it is fresh and healthy... Stay firm, they will come around.
The other method is to transition over by putting out the new food in small quantities in a bowl appart from the prior food and gradually you increase the supply of the new food and reduce the supply of the old.
It depends on your parenting methods... Tough love? Negotiating change? Or marshmallow fluff? Since I see no downside to having spoiled pets, I am a marshmallow.