Preheat your oven to 425 degrees Fahrenheit.
Chop the potatoes, celery, onion, and bread cubes, and mix them together in the baking dish. Drizzle with olive oil and season with sea salt, white pepper, onion powder, and garlic powder.
Place the bone-in, skin-on chicken thighs on top of the vegetable mixture. Drizzle the chicken thighs with olive oil and Season them with sea salt, white pepper, and dried thyme.
Bake the chicken thigh bake at 425 °F for 1 hour and 15 minutes or until the chicken is cooked through and the potatoes are soft. The chicken skin should be very crispy and golden brown and the juices should run clear.
Serve each chicken thigh along with a scoop of the delicious potato, sourdough mixture and enjoy!