Suggest one night of the weak where your whole flat cooks together to spread the cost!
When I lived in halls we had fajita night. We took it in turns to buy the Odel Passo pack and then everyone else chipped in meat and veg, sour cream, guacamole etc. It was fun to all cook together, discover who’s never cooked before and whose secretly a Michelin star chef! These are also the kind of dishes you just can’t cook for one!
I had other friends who did a roast on a Sunday! No one could afford, let alone EAT a whole roast chicken to themself, and it also made halls a bit more homely on a Sunday when everyone was hungover!