"Prepare one meal each day." ???
I deduce that you do not have 8 children.
Wow. I envy you. :-)
If you are working hard at household chores and meals with 8 children, I would suggest you might consider delegating some chores.
We have nine. My oldest makes breakfast every morning. All children do a complete cleaning of the house every Saturday morning before they are allowed to do anything else. The four oldest do all the laundry, including sorting, loading the washer, switching loads and folding. My wife just supervises. We have three in diapers still (one is special needs). My oldest changes the special needs, my second changes the two-year old, and my third son changes the baby.)