Coat the chicken breasts with spices, massaging both sides before flipping.
Add chicken to a hot non-stick pan on medium heat and cook 5-6 minutes per side until golden and cooked through. Remove and set aside.
Slice peppers and onion, then cook them in the same pan on medium heat until soft, about 5-7 minutes.
Shred the cooked chicken using two forks or a hand mixer.
Add shredded chicken to the veggies and sprinkle additional seasoning if desired. Mix everything well.
Add tomato sauce. If you’re using a tomato sauce that is slightly thick, add the tomato sauce to the pan, then fill 1/3 of the bottle with water, shake, and add it to the pan, mix, and simmer for 5-10 minutes, covered to prevent splashing.
Turn off the heat, chop fresh cilantro, and mix it into the pan.
Press a tortilla into the sauce, add shredded cheese and chicken mixture, and fold the taco.
Grill each taco in a clean pan on medium heat until crispy on both sides. Serve hot.