if you have a crock pot, look up some recipes online or find a crock pot cookbook. You can make several meals from one cooking in the crock pot (if you cook chicken or a turkey breast, you can have the meat with a side item one night, make sandwiches, salads, soup, etc.) You can portion out leftovers in a muffin tin, freeze them, then put the frozen portions in a ziploc bag to use later (got that tip from another Sparker, MALIA4URU).
salads are quick and easy, so are sandwiches. And both offer LOTS of variety.
the downside of living alone is that cooking for one is kind of a pain. The upside is that you only have to cook if you feel like it. When I lived alone I would go for weeks eating the same thing because I didn't want to go to the grocery (expense, and just an inconvenience).