I have heard that asparagus are good winter vegetables. If in the right spot, you don't have to do hardly anything, except keep cutting them and eating them! That is one I hope to try soon.
I had a great harvest with tomatoes one year in particular, and hardly did anything. The next year the soil wasn't as good, as it was too depleted. If you can maintain healthy soil, tomatoes are a good winner.
Besides those, I have grown squash very well for a few years as well at tomatillos. I like herbs, like cayenne, and different peppers as well. They are hearty in bad soil conditions I have found.