Are you up for making the broth from scratch?
If so, start by shredding the meat off of the rotisserie chicken. In a large pot, sauté a quarted onion, a couple of carrots and celery sticks. Add the chicken bones, cover with water, and simmer for an hour or two. Strain the solids out of the broth.
In a clean large pot, heat a bit of oil or fat, and add a diced onion, diced bell pepper, and some garlic. After a few minutes, add the broth, reserved chicken meat, and any other veggies you like: diced carrots, sliced celery, and frozen peas are my favorites. Add a cup or so of dried pasta (egg noodles, broken-up pieces of spaghetti, or orzo), and simmer until the pasta and veggies are tender. Season with salt & pepper to taste; I also like adding some fresh herbs like basil or parsley.
You can substitute canned broth, but it won't be nearly as good.