I make a big load of "savoury" mince but pad it with other things so I'll cook one single pack (500g) of mince with 2 or 3 onions (depending on size), a leek, kidney beans, mushrooms, courgettes, whatever colour pepper (frozen peppers are good for this), frozen peas, both grated and chopped carrots (grated sort of disappear but still bulk it out) a couple of cheap tins of chopped tomatoes, some beef stock to make more sauce, mixed herbs, black pepper, rosemary (for cottage pie/spag bol) or chilli powder for chilli! Plus you can add any veg into it thats sat in the bottom of the fridge looking a bit sorry for itself, just chop it up finely!
Serve with rice/pasta/potato or just on its own!
It will go further if you have it with other things though. And its fine to freeze too.