Pasta dishes are always a good idea!
I: Put a can of tuna in a saucepan and chop it up, top with a packet of Knorr Tomato Al Gusto with herbs and a little bit of ketchup. Heat. Crumble about 5 slices of cheese, toss in, stirring until melted. Add seasoning (especially salt, bell pepper, paprika, garlic. Some oregano is also good).
Both recipes are intended in size for about 250g pasta.