*Sweat onion, celery and carrots in 2 tbsp olive oil in a large stockpot over medium heat for 10 minutes *Stir in chicken broth, bring to a boil at medium-high heat *Add the chicken and tortellini, reduce heat to simmer until tortellini is cooked through, 6 to 8 minutes. Be careful not to overcook tortellini or they will get "mushy"! *Just before serving, stir in fresh spinach and let simmer for a minute. *Season with salt and pepper *Ladle soup into bowls and sprinkle with Parmesan Cheese. .