It's big, filling, cheap, and you can cook the whole damn thing at once: Spanish Tortilla is the best thing to make if you have some friends coming over for brunch.
The Spanish Tortilla recipe in How to Cook Everything is basically a big pile of potatoes, eggs and onions cooked together in one pan. You sauté some onions and thinly sliced potatoes until soft in a large skillet (it helps a lot if it's nonstick). The potatoes and onions cook together in a whole bunch of olive oil--one cup. It's a lot, but you drain it out before adding the eggs. After draining the oil, 6-8 eggs go in a bowl with the potato-onion mixture, and that goes back into the pan (add some of the oil that was drained before you add the potato-egg mixture to the pan. You just cook this over medium heat until the edges firm up. Then, using a spatula to loosen the tortilla from the pan, transfer it to a large plate, turn it upside down using another plate, and finally return it to the pan, thereby flipping the tortilla. Cook it for another five minutes or so, and it's done. This thing is damn tasty, and it can be served warm or room temperature. I want some right now.