If you have pasta and rice and tinned tomatoes and lentils and/or tuna in the in the cupboard then yes, also ideally frozen peas and maybe tinned sweetcorn - then buy some potatoes, veg of whatever kind you can pick up cheaply, big cheap block of cheddar to grate
If you have pasta then make a pasta sauce with reduced tinned tomatoes, lentils to bulk if you have them. Drop in any veg you can pick up cheap.
If you have rice then do a risotto with frozen peas, bit of cheese to serve.
Baked potato night - cook the potatoes, scoop them out mix the inside with grated cheese, sauté onions and mushrooms / whatever, and put it under the grill to brown.
or you can do it with tuna, if you like cooked tuna.
Tortilla - Spanish omelette with whatever veg you can pick up cheap. If you don’t have potatoes tinned ones work very well.
Tomato Potarto pie. Boiled potatoes, tin of tomatoes, ideally some precooked onions,a lot of grated cheese, in the oven to brown.
Pasta pie, as above but with pasta. Some people do tuna pasta bake.
Macaroni cheese. Going heavy on the mustard allows you to get away with cheaper less flavourful cheese.
if you are more of a cook:
You could also make a Tuscan bean stew - basically tinned tomatoes, butter beans (or whatever kind you have). I am mostly to lazy to cook but this is lovely.
veg chilli with either black beans or lentils
As you can tell I am not a cook, but Jack Munroe and BBC food are both good for recipes