In my first raised bed gardens, I planted some green onions that came back every year.
This year, I was surprised to find onions that I planted last year had survived the winter and are growing.
Sage, oregano, and winter thyme come back every year. Getting bigger too.
For a survival garden, I am thinking need to plant hardy veggies. More root veggies, like beets, rutabaga, carrots, potatoes.
For greens, I have found chard does well.