I used to do tuna bread, it was my emergency quick fix before training.
Can't remember exactly how to make it as i haven't done it for years, something like, tin of tuna in oil, flour, egg and a bit of garlic, mixed up, onto a plate then microwaved for a few minutes, cooled and cut up.
Not got enough life on my iPad to search for anything but I got the initial recipe off here I think.