Dice the chicken breast into bite-sized pieces and season with half of the sea salt and black pepper.
Heat the olive oil in a large pot over medium heat and sear the chicken until golden brown on all sides, then remove and set aside.
In the same pot, add the diced onion, carrots, and celery, sautéing for 5 minutes until the vegetables begin to soften.
Add the minced garlic, dried thyme, and diced sweet potato, stirring frequently for 2 minutes to release the aromatics.
Pour in the chicken bone broth and bring the liquid to a gentle boil.
Reduce the heat to low, return the chicken to the pot, and simmer for 15 minutes until the sweet potatoes are fork-tender.
Stir in the chopped kale and the remaining salt and pepper, allowing the greens to wilt for 2 minutes before serving.