Sometimes, if I get in late from work say 9-ish and I'm starving, I do some polenta. Even quicker than pasta and equally, if not more, filling. Stir in butter, grated cheese, tuna etc and you'll feel quite sated in no time. The amount of water you need for one person takes no time to boil and so it's cheap on fuel too. If you can think ahead, soak some dried porcini in water/milk earlier in the day and then fry up and stir in to thickening polenta mix just before serving.