I agree with the cumin sentiment. I'm also a big fan of cutting up any leftover meats: sausage, bacon, cooked ham/steak; and throwing it in a pan with some onions and leftover veggies. Then, after they're all heated up and the onions are soft, I throw in a bunch of scrambled eggs and cheese and serve it on a tortilla with salsa. It's not necessarily the healthiest meal ever but you can do the same with tofu instead of meat to make it a little less caloric. In that case you'll probably need a little oil or butter though.