If this is just one breakfast, not in the dead of winter, you should consider a not-cooked breakfast; it will be tough enough just getting the coffee water hot. Muffins, fruit, string cheese and previously cooked hard-boiled eggs; maybe granola?

If you want something hot, take a look at the hay box or fireless cook stove. It is the original "slow cooker". You would put the stuff in the night before.

Here are some sites:
practicalaction.org/fireless-cooker- also offers some thought provoking information for a church group.

www.instructables.com/id/Hay-Slow-Cooker/