Add chicken broth, tomatoes, cumin, season with salt and pepper to taste and add chicken breasts if using (otherwise wait to add rotisserie chicken until the end). Bring mixture to a boil over medium-high heat.
Then reduce heat to medium, cover with lid and allow to cook, stirring occasionally, until chicken has cooked through 10 - 15 minutes (cook time will vary based on thickness of chicken breasts).
Reduce burner to warm heat, remove chicken from pan and let rest on a cutting board 5 minutes, then shred chicken and return to soup. Stir in cilantro and lime juice, and rotisserie chicken now if using.
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