I too am wondering why you've left it so late!
Remember to bring all recipes down to "for 1" sizes because to be honest storing full meals in shared fridge or freezer is
1 asking for it to be nicked!
2 means it's unlikely to get used but will fester until thrown out & that will put him off bothering.
Basic tomato sauce using cheap mostly non-perishables
Passata, tinned tomatoes, dried herbs/spices, if poss fresh garlic, onions & celery for base.
Can be used for pasta, chilli, curries, stews, stir fries just by varying the herbs & spices.
Basic white sauce - honestly I wouldn't bother with a roux, I'd go with doing cheats versions using bases of cream cheese, creme fraiche or sour cream.
Eg
stroganoff - sour cream, paprika, chilli powder, garlic, splash of white wine.
Creamy garlic pasta sauce - garlic & herb cream cheese, splash of milk, extra herbs & garlic if desired.
Cheesy pasta sauce - creme fraiche, grated cheddar, garlic, touch of mustard.
Then there's more specific sauces:
Sweet & sour - stock, tomato ketchup, vinegar, soy sauce, spices
Satay sauce - peanut butter, soy sauce, onion, garlic, chilli (fresh or dried)
Teach him shortcuts to make chopping veg, meat or poultry quick & easy & easy to tidy up (eg rinsing seeds out of peppers) & budget planning.
Teach him quick, easy ways to assess portion control - eg I know half a mug of cous cous per person suits us but I use a certain mug, I use a different mug if making up gravy and it's 2/3 etc
I would recommend he have the following in as a general stock of products:
Dried Herbs & spices
Garlic
Tomato ketchup, Salt, vinegar, mustard, Mayo, tomato purée
Tinned fruit and veg (baked beans of course, but also peas, green beans, peaches, pineapples, mandarins, grapefruit. Sweetcorn, carrots, spinach, creamed mushrooms - lovely on toast and can also be a sauce on pasta etc)
Instant mash - quick & easy plus a thickener if sauces a bit thin.
Marmite - for toast (adds a bit more nutrition than just butter) also depth of taste for sauces.
Peanut butter - again toast but also satay sauce.
Pasta/dried noodles/rice/cous cous
Stock cubes.
Honey - toast again 😂 but also for sore throats - common in first term as they're talking more than usual, late nights, drunk vomiting and shouting in nightclubs/at sports events.
Tinned meat & fish (tuna, corned beef, spam)
I'd also recommend: measuring spoons, small measuring jug (also useful for making up mash and cous cous), good sharp veg knives - plural because who has time to wash up every day? Good tip I read on here - have his own washing up bowl so if he needs to wash his dishes he doesn't get suckered into doing everyone else's too! Also useful for if he needs to be storing the clean stuff in his rooms if he's got a light fingered housemate!
Quick cheap easy dishes:
Bolognese
Cheesy or pesto pasta
Chilli
Stir fry
Stroganoff (basically stir fry again but makes a change)
Omelette/frittata
Fry up (teach him to organise timings)
"On toast" - beans, spaghetti, creamed mushrooms, eggs (fried, poached, scrambled), tomatoes
Baked potatoes - topped with tuna/chicken mayo, beans, cheese, chilli - good way of using up any excess sauces made for other things.