Pour the taco seasoning, oil, lime juice, and salt and pepper to taste in a zip-top bag, and seal. “Massage” the bag to distribute the marinade evenly. It will be paste-like. If you want the marinade more fluid, add more stock.
Place the chicken breasts in the bag. Massage the bag to thoroughly and evenly coat the chicken.
Marinate the chicken in the refrigerator for at least 30 minutes, up to 2 hours.
Preheat the oven to 425 degrees. Prick the potatoes all over with a fork.
Rub the potatoes with 2 tablespoons of the oil, salt and pepper to taste.
Bake the potatoes in the preheated oven for 45 minutes to an hour, or until a fork pierces easily to the center of the potato. See Notes for alternative cooking methods.
If you can time it, in the last 20 minutes of the potatoes cooking, remove the chicken from the marinade (discard marinade).
In a skillet or shallow pan, heat 1 tablespoon of oil. Saute the chicken breasts, browning both sides, and cooking until a thermometer reads 165 degrees. Remove the chicken to a cutting board. Rest for about 10 minutes.
Using two forks, shred the chicken, cover and keep warm. Alternatively, you can thinly slice the chicken.
When the potatoes are finished cooking, remove them from the oven, carefully (potatoes will be HOT) cut a slit in the top of each one and top as desired.
Serve hot and enjoy!