Yeah, *briefly* heating soups, stews or maybe rice or grain based dishes to boiling, then covering and immediately stashing in a haybox cooker, is probably the least likely to spread appetizing odors.
For those in suburbia, this has to be seriously taken into account in your prepping... probably consider concentrating on canned goods that can be eaten cold if necessary (or just warmed up), or freeze dried "just add boiling water" camping type foods... expensive, but maybe worth it (or at least a few days worth so you can lay low at critical times). Also, although long term storage might be a problem, stuff like a high quality granola, jerky, or even a modern version on pemmican coukd be priceless. Odorless, tasty, concentrated calories and nutrients. Vacuum sealed nuts, and dried fruits like raisins, dates, apricots, prunes, are excellent sources of concentrated calories (don't overdo the prunes!) And they keep a LONG time... I recently opened a bag of pitted prunes from 1999 (got lost behind the lamp oil in my spice cupboard)... they were *maybe* slightly stickier than absolutely fresh, but flavor, texture, etc were fine. No, er... after effects, either!
And, for shorter term, make sure you stay stocked on peanut butter, crackers and hard cheeses...
Summerthyme