My childhood favorite recipe that my kids now love. They normally eat a lot when I make it.
Boil the pasta according to the package's directions.
Strain the pasta once it's done cooking.
Return the pasta to the pot and add the canned tomatoes, cheese, milk, and butter. I normally check the liquid level after adding the tomatoes and then decide how much more liquid (a.k.a. milk) I should add.
Turn the burner down to low and stir the pasta until it's heated through and the cheese is all melty.
Dish and season with pepper to preference.
I normally leave out the butter.
If you want to double the recipe you can easily add another pack of pasta and use two cans of tomatoes. Normally I used similar-ish amounts of cheese and if I cook a single pack of pasta it's more cheesy than if I doubled it. (I used an Ikea grater and try to pack it in more tightly when I double the recipe.)