Beans. I can't tell you how much I'm loving bean/legume soups these days.
Just ate a Southern favorite for lunch: Black Eyed Peas with just enough smoked turkey sausage to add flavor and some Rotel tomatoes for acid and a little kick.
I eat beans because I love them, but something like this is also
super cheap: I'm going to guess around 6 dollars total for enough to feed eight.
Very nutritious: tons of protein and fiber and calcium in black eyed peas!
Very filling/energy-rich for your hubby: You could also cook rice to go along with it as well for more bulk, or pan fry some of the leftover turkey sausage and add it to his.
It freezes well, it tastes delicious, and it's mild enough (especially if you leave out the Rotel) for the 3-year-old's palette. Although, she might appreciate it more if you mushed the beans up.
Leftovers are pretty versatile as well. Mashed, they can be turned into fritters or even used as a spread/dip/filling for just about anything. Kind of like a substitute for refried beans, or a funky hummus.
Okay, ode to black-eyed peas is over. Can you tell I enjoyed my lunch?