I fix this often instead of buying the Spaghetti O's and Chef Boyardee in a can. This is cheaper to make and I think tastes better!
Half dollar-size width of dry spaghetti (about 2 cups cooked)
1 can tomato soup
2 slices American cheese
Cook spaghetti according to directions and drain. Mix in one can of tomato soup and American cheese. Stir until cheese is melted and all is combined. Enjoy!