OP, your idea of mini quiches is a great one. I make something similar in muffin tins. I put in any filling I have unhand, usually cheese, broccoli, sometimes bacon, and scrambled some eggs with half and half and then bake them. They freeze well and would be a good plan for your charge.
Do you use any sort of crust on the bottom?
PP here. No, i don't use a crust. I do spray with cooking spray or lightly butter the muffin tins so they don't stick.
I usually put the veg in first, then the eggs, and put the cheese on the top.
Hope this helps.