Home-made soup with bread - about once a week in the winter. I usually do something like minestrone, squash and red lentil, or cabbage and white bean (nicer than it sounds). Easy and cheap to make. We will then use what’s left for lunches. Find this filling enough for a dinner, though sometimes put a sandwich or cheese on toast with it, or will have desert of some kind that day too.
I don’t think we’d eat tinned soup for dinner, I haven’t bought it in years actually although I used to love Heinz cream of tomato!
Eggs/ ‘something’ on toast - every so often, can be once a week sometimes other times won’t be for ages. Tends to happen more frequently when DH is in charge of cooking! Usually add some kind of veg or a piece of fruit on the side.
Jacket potato - not that often as DH isn’t really a fan and DD didn’t used to be, but she recently told me she likes them now so perhaps I’ll start adding them in on nights DH isn’t eating at home.
All of those options you listed can be the basis of a really balanced and nutritionally complete meal - e.g the scrambled eggs on decent bread toasted, maybe grate a bit of cheese or even sprinkle some nutritional yeast over. If the kids will eat it you could add a bit of spinach or some mushrooms, or a bit of avocado on the side (I know that’s not very budget friendly though). I used to do cheese and spinach eggy bread quite often - DD won’t entertain it now sadly.
Tomatoes, a satsuma or glass or orange juice - vitamin C aids the iron absorption.
They would all probably be options I would go to over cheap sausages or breaded chicken honestly.
Another cheap and easy favourite I do is cook pasta, add frozen peas to cook with it towards the end, stir through some butter or oil and then loads of grated cheese and black pepper. Not the healthiest but genuinely one of my favourites.