1/2 an onion, diced
a few handfuls of baby carrots, cut bite size
1/2 a spaghetti squash, peeled, de-seeded and then cut into chunks
green peas (frozen or fresh)
other veggies like broccoli and cauliflower would also work well
At Stage 3 you can add celery.
I put the squash in uncooked and let the soup come to a boil, then reduced heat to a simmer. Once the squash was tender I mashed it with the backside of the spoon to make it separate into "noodles. You could also bake the spaghetti squash in advance, but I didn't plan ahead. I put boiled, shredded chicken in the bottom of the bowls then ladled the soup on top.