a few ideas:
Corned beef hash using corned beef, onions, potatoes. Serve with bisto gravy
Chicken:
Meal 1: roast chicken, roast potatoes, & veg. Serve with stuffing and bread sauce ? you?ll use less chicken
Take leftover chicken off the bone, freeze in two lots, use later for meal 2 with Chasseur sauce (tin) and if enough meal 3 with red wine sauce (bulk out with veg)
Serve with noodles
Boil up chicken carcass with onions; remove carcass and take off any chicken. Make a broth and serve with dumplings
Make cauliflower cheese with cauli and cheese sauce mix. Serve with sausages.
Make lasagne using your tinned minced beef and peas, adding tomato paste
Use naan bread as pizza base: top with tomato paste, onions, cheese (bacon bits if you can spare them)
Bananas & custard
Make soup with storecupboard chicken stock and your choice of veg; freeze cos you?ll make loads. Add noodles for bulk.
Buy some very cheap plain flour and make pancakes
Add dried fruit, apricots, cranberries to your porridge oats to make muesli
Boiled eggs, mixed with cooked leeks & cheese sauce, topped with mashed potato
Lamb knuckles served with mint sauce, any type of potatoes, veg
Ditto pork chops
Pasta, cooked gammon steaks, sweetcorn, mayonnaise for a pasta salad
Fishfingers & beans