I meal plan - have done for a long time. Kids have lots of choice at school lunchtime so while I try to take into account what they might be having for lunch when planning school day tea times, I am increasingly getting complaints that what I offer is not enough ("food ran out because we were last in Mum") or too similar to what they had ("I didn't have x [what I thought they would have] because I fancied y")
Because of the plan I don't have much "spare" food around and neither do I have mind reading skills 
Apart from sandwiches what would you rustle up if having to go "off piste" from the plan- I'm thinking things in the freezer or cupboard that can be cooked quickly but which are not crumbed or involve eggs