Back when I we were even poorer than we are now I can remember Grilled Cheese + cheap tomato soup being one of our staple foods. Along with very basic spaghetti.

Haven't had any since. We got kinda tired of such foods after eating them exclusively for like 4 years. Eggs are another thing we could get cheap. So our diet was basically Eggs, Grilled Cheese, and Spaghetti.