1 1/2 Tbsp olive oil
1 1/2 cups chopped carrots (from about 5 medium)
1 cup chopped celery (from about 3 stalks)
1 cup chopped yellow onion (1 small)
4 cloves garlic, minced
4 (14.5 oz) cans low sodium-chicken broth
1 1/2 tsp Italian seasoning
Salt and freshly ground black pepper, to taste
12 oz refrigerated three cheese tortellini*
1/2 cup packed parsley (stems and all), plus more for serving
2 1/2 - 3 cups shredded rotisserie chicken (from one 29 oz chicken)