Twit - could you not have spag bol? Adjust the meat recipe (everyone's recipe is different!) if required then make your "pasta" from strips of courgette fried in butter/oil?
What about using mince to make lasagne (use leeks as per the 'hairy dieters' recipe for the pasta sheets), or cheeseburger pie (mince bottom layer then a cheesy eggy top layer) or chilli (extra veg instead of rice if you can't be bothered to do cauliflower rice - I never can!) or homemade burgers (with salad or veg or make oopsie rolls) or moussaka? That's off the top of my head but all dishes my lot will eat - I adjust to suit me, add in extra veg if I need (DH & dc can also have) plus a carb for the carb eaters.
Other cheaper meals include
Cauliflower cheese - can add bacon or serve with sausage (baked pots for carb eaters) if required but I find it filling on its own.
Tomato soup (great store cupboard recipe from passata - a Carolyn Humphries LC recipe) - add rolls and a pud for carb lovers
Bacon and egg pie - divide with pastry top for 'them' and crustless for you with salad or veg
Crustless quiches with salad or veg (hm chips for the carb eaters)
I sometimes do bacon & egg for tea for me and give the family pizza or jacket pots - helps keep costs down by limiting the meat to one person or I save a portion of another meal for me so I eat leftovers.