Preheat the dutch oven or large pot over medium heat.
Chop the onion; mince the garlic.
Add olive oil spray to the pot, and add the chopped onion.
Saute for 5 minutes or until tender.
Add the minced garlic and saute for another 1-2 minutes or until just fragrant (careful not to burn).
Add the tomato paste and stir to combine.
Pour in the fire roasted tomatoes, diced green chilis, and chicken broth. Add in the cumin, chili powder, paprika, and salt. Stir to combine.
Increase the heat to medium high, and bring the liquid to a boil.
Place the chicken breasts into the boiling liquid, and reduce to medium heat. Simmer for 20 minutes or until the chicken is cooked through to 165F.
Remove the chicken and set aside on a plate; shred using two forks.
Return the chicken back to the pot. Add the juice of the lime, and the cilantro.
Tear or cut the tortillas into smaller pieces and stir them in and simmer until they dissolve.
Serve with sour cream, cheese, tortilla chips, and more cilantro, if desired.