I tend to eat the same thing for about 3 or 4 days in a row for lunch, and then switch it up. One of my standards is to drive through Wendy's and pick up 3-4 small chilis with onions. When I get home, I mix in defrosted broccoli and cauliflower and add hot sauce. About 300 calories total for each serving and very filling.
(The college I attended served this vegetarian chili with broccoli and cauliflower,beans, other veggies, etc., and I got addicted to the combination...as a meat eater though, mixing the veggies in with Wendy's chili gets pretty close to the same flavor with the added benefit of beef