Risotto if you have any suitable rice in cupboard - simple base with onion, rice, butter and stock cube then whack in any odds and sods you might have lurking in the fridge: left over cooked chicken/few rashers of bacon chopped/handful of frozen peas/grated parmesan/peppers/mushrooms/sausage etc
Macaroni cheese - pasta, butter, flour/cornflour, milk, cheese; throw in any green veg you have on side.
Carbonara - spaghetti, egg yolks, parmesan, bacon
Tomato sauce for pasta - tinned toms, chopped onion, garlic, pinch of sugar, dried herbs - can throw in small amount of any other veggies/meat/fish you have and top with grated cheese
Corned beef hash - boiled potatoes, onion, tin of corned beef
Eggy bread +/- bacon/sausage/grilled toms
Cauliflower cheese and rice
Veggie chilli - tinned toms, tinned beans (kidney/chickpeas/baked beans etc), onion +/- chopped pepper, chilli powder/paprika
-serve with rice/cous cous/ jacket spud/sweet potato/wraps
Google Jack Monroe recipes for inspiration.
Hope things get a bit easier money wise soon x