I'm assuming a bit of knowledge here, OK. This was SO delicious.
some broccoli and some frozen peas - enough for one person
and for the sauce
15g plain flour
about 7g butter
50g strong cheddar (Aldi's is strong and cheap)
8g grated Italian hard cheese - Morrisons Savers
pinch of mustard
Preheat the oven to 160-ish C
Cook the broccoli and peas (in the same pan is fine)
Cook the macaroni
Make the cheese sauce
Spray oil into a single portion oven proof dish. spread the veg on the bottom, then add the macaroni, distributing evenly. Spoon over the cheese sauce, ensuring everything has a thin coating. Sprinkle over the hard cheese.
Bake in the oven for about 15 to 20 mins until the top is just starting to brown.
Eat straight out of the dish - it's nicer that way, honest!
Total cost for me: 53p