Place the chicken breasts in the bottom of the slow cooker.
Add the sliced bell peppers and onion on top of the chicken.
Sprinkle the fajita seasoning over the vegetables and chicken.
Pour the chicken broth and salsa evenly across the top.
Cover and cook on low for 6 hours until the chicken is tender.
Remove the chicken, shred it with two forks, and return it to the slow cooker. Stir everything together.
Divide the cooked rice into four bowls and top each with the chicken mixture.
Serve with lime wedges and chopped cilantro.