What a great thread!
I find it's easy to cook cheap meals this time of year. Lately, my favorites:
Scrambled eggs with veggies, usually it's yellow squash or zucchini. Dice it really small, then sautee it in butter, then add the eggs and scramble, and add some cheese at the end.
Something we call bean stew. In the crockpot: 1c salsa, 1c or so of water, one diced small- sweet potato, three cans total of black and pinto beans, some frozen corn, and some...