I always do big portions of chilli and chunky veg soups and freeze them - great for when DH works away and i'm on my own. If your not keen on rice get some tacco shells and just half/quarter the box and use the chilli in them?
Soups always nice with some chunky bread and butter too!
I usually have the 'treats' bits in too for quickies - ie; waffles & fish fingers and i tend to eat a lot of salads with this too...
Simple things like Jacket Pot's with tuna majo & salad - beans & cheese - cottage cheese & pinapple chunks - chilli lol
Other jacket idea's - boil an egg and cook a large pot (big enough to fit an egg in) scoop out the potatoe bit just leaving a thin layer and the skin, put half the boiled egg in each half, put the potatoe back over the top and sprinkle a little cheese, bake under the grill until nice & crispy bit of salad YUM!!
When we buy a pork loin, we cut it into meal sizes and freeze so its good portions for one or two and get some mixed veg depending what you like of course - we love all veg so buy quite a lot but best for one if you buy a small bag of mixed veg and then there's no waste?
Same with chicken - buy some ready made stir fry or peppers and onion and make fajita wraps!
Fish pie is another one of our quickies, the healthy options are really nice and great for chucking in the oven with some green beans or broccoli
And of course we have pizza's as back ups...
I know how annoying it is cooking for one and most of the time i can never be arsed so i make do with soup or fish finger butties! lol and sometimes just a bowl of cereal, but i'm always happy with just that! Not good for every night but just a one off
That probably wasnt much help, if i think of anything better i'll let you know xx