I have rats, so they do great on just about anything. Literally. When I don't have a good supply of table scraps, I feed mainly
this dog food with 1/4 to 1/3 the amount of dog food of
this cat good (indoor or normal formula).
The dog food is about 18 dollars for ~15 pounds, and the cat food about the same at Petco with a PALS card. I can't find a place with a good lab block in bulk and can't be bothered to spend the effort when they probably won't be able to order it.
I really want to note that rats are extremely adaptive and I
did have a rat go through most of her pregnancy and nursing phase on mainly various table scraps and a few hard boiled eggs each week with no problems. I highly highly doubt mice could do that.