Here is what you do.
Cook a packet of spaghetti til it's al dente (I say that to make this seem fancier and more foodie than it is, truth be told, but DO cook your spaghetti nicely)
Then you need
One warmed tin of condensed tomato soup (don't add water! must NOT be salt reduced! if you like a lot of sauce, get the biggest can of soup)
One block of Kraft cheddar cheese, grated (this is the one that is NOT kept in the fridge at the supermarket)
You cook the spaghetti, as we said.
You use the warm non diluted soup as the pasta sauce.
You put a LOT of cheese on top.
You eat it up.
Shame. Shame. Shame. Yum.