Place chicken breasts in slow cooker.
Sprinkle taco seasoning over chicken evenly.
Pour salsa over seasoned chicken.
Add drained diced tomatoes to mixture.
Pour chicken broth around chicken pieces.
Cover and cook on low 4 hours.
Remove chicken and shred with forks.
Add cream cheese to slow cooker.
Stir until cream cheese melts completely.
Return shredded chicken to slow cooker.
Add Mexican cheese and stir well.
Cook 15 minutes more until heated.
Warm taco shells according to package.
Fill shells with chicken mixture.
Garnish with fresh cilantro and serve.