S.,
You could make breakfast burrtios- precooked scrambled eggs, cheese, cooked potatoes, cooked veggies, or peppers, cooked meat. Anything they like and make them ahead individually wrap then freeze. When you need one for on the go: microwave for 1 minute and then wrap in foil it will stay hot for quite awhile. This method also works well to make frozen burritos.
Another option is to make a breakfast sandwich use a bagel, toast, or engilish muffin for the bread. Fry or scramble an egg, add a slice of cheese and some lunchmeat, microwave for a few seconds, then wrap in foil to take along. (shiny side in).
I cook hamburger, ground turkey, or bulk sausage in my crock pot. No need to add any additional liquid. On low for 6-8 hours or high 3-5 hours. Then its ready for any recipe as soon as you get home. Makes a good sloppy joe.
I also will put a whole chicken in my crock pot with seasoning (salt, pepper, onion powder, and garlic powder) add NO additional liquid. Put on low 8 hours and it tastes very much like a deli roasted chicken. You can also use the left overs to make chicken salad, and let the kids eat sandwiches or scoop it up with tortilla chips, or whole wheat crackers.
My boys also love egg salad. Sandwiches would be very easy and you can make the fillings ahead of time, (sometimes I will make sandwichs and individually wrap them and put them in the fridge for busy nights).
Scrambled eggs reheat really well, as do pancakes or french toast (just pop in the toaster). Sausage patties also are easy to reheat, and if you precook frozen hash brown patties I have reheated these in the toaster or toaster oven successfully too.
Sometimes we even make hamburger patties (make a bunch all at once and cook them on a cookie sheet in the oven 350 degrees for 20-30 min) then either refrigerate or individually freeze and when reheating put a slice of chees on top if you want and you have easy, fast cheeseburgers.
Good luck, and I hope I helped.