Preheat your oven to 400°F (200°C).
Scrub the sweet potato and prick it several times with a fork. Place it on a parchment-lined baking sheet and roast for 45-50 minutes until tender.
While the potato roasts, rub the chicken breast with olive oil, sea salt, black pepper, and garlic powder.
Place the chicken on the same baking sheet during the last 20 minutes of the potato's cooking time, roasting until the internal temperature reaches 165°F.
Place the pecans in a small dry skillet over medium heat, tossing frequently for 3-5 minutes until fragrant and lightly toasted.
Remove the chicken from the oven, let it rest for 5 minutes, then shred or finely dice it.
In a small bowl, mix the shredded chicken with the Greek yogurt and chopped chives.
Slice the baked sweet potato down the center, fluff the inside with a fork, and stuff it generously with the creamy chicken mixture.
Top with the toasted pecans and an extra sprinkle of chives before serving.