Looking after 4 children all week, including 2 prw-schoolers, I don't know how the OP even manages to find time to prepare meals for them. As for a meal that they will all eat - I find it hard enough to find one meal that two GC will eat, never mind four of them!
Bopeep, you have my utmost respect for managing to look after that many children at once ! 
Favourite small treat when feeling blue or conversely a bit flush

