I was so flabbergasted that I didn’t know how to respond. You hit the nail Manue.
@Perris, KFC is very much a no go.
And when that happened here, the useful advice you gave was to try to scatter the crumble on the floor or on a plate, because mum wants the kids to learn to scratch. The feeder itself can be the reason why she won't let them eat.
Once more, everyone makes their own choices and conclusions. There are a million ways to do things. And broodies might know this too.
If someone gives an advice you don’t like, don’t follow, if it doesn’t suit you. Learnt that with my own babies when I was a very insecure mother.
Also, if a broodie knows better bringing up her chicks, let her. Even if we like her to do things as humans have written.
Don't worry too much. There are a million ways to do things right.
But it didn't work for Léa 's hatch, so MJ just in case I would make sure to have around for their first days some eggs (should not be difficult

) and bread that hasn't got a list of ingredients as long as my post.
When I was a child my mother had a aviary with canaries. When they hatched baby-canaries, my mother always gave them mashed rusk with egg. Nothing else, nothing balanced. And that went well too.
My own chicks/chicken mamas get a mash made from chick feed and water. And the mamas search for extras to give to her chicks as soon as they come out of the coop and into the small run. The mammas call the chicks when there is food for them to eat.
A lot is good food for the chicks in her eyes: the insect she finds herself of course. And whatever she gets from me: pieces of fruit , tiny grass clippings, dried and broken mealworms, pieces of cooked spaghetti's, cooked rice.
I also give the chicks stomach grit for doves on the side as soon as the chicks start to eat extras in case the sand in the run is too fine to grind.
My thinking, if it’s no good, the mamma wouldn’t call the chicks to eat it. The basic feed still is the mash / chicken feed I give them. Even after 4 months.
The chick feed I have this year has 19% protein. If the feed has 23% protein, I would think there is no need at all to give extra high protein feed like dried mealworm.