Poke holes in chicken breast with a fork then place dressing in a large sealable bag, and put the chicken inside. Allow it to marinate in the refrigerator for about one hour
Heat olive oil in non-stick pan on medium, and cook chicken covered, for about 5 minutes on each side. If chicken breasts are thick, you might need to cook longer.
Place chicken on a cutting board, and shred using two forks.
Place shredded chicken back in the same skillet, sprinkle in salt, and stir.
Add onion, garlic, and cilantro and stir to combine. Cook for about 10 minutes on medium, stirring often.
Add dressing and stir.