My vote is for the bread pudding, and that pizza thing is good,too, but...
French toast.
Mother always saved that sort of stuff in freezer for lots of things with hamburger meat. I do the same now.
Run bread under water, squeeze water out and mix thoroughly into your hamburger meat with chopped onions and whatever other things you want to add for "hamburger steak."
Same sort of thing with meatloaf.
Stuffed bell peppers - brown beef/chopped onions & garlic. Wet and squish bread and mix into meat mixture thoroughly. Add a little water and cook some more. Stuff peppers with mixture, bake, etc. Can top w/ cheese, spiced up tomato sauce...whatever strikes your fancy but I like plain.