Preheat your oven to 400°F (200°C).
Scrub the russet potato thoroughly and prick the skin several times with a fork to allow steam to escape.
Rub the potato skin with olive oil and a pinch of sea salt, then place it directly on the oven rack and bake for 45-60 minutes until the center is soft.
While the potato bakes, season the chicken breast with garlic powder, onion powder, half of the salt, and half of the pepper.
Heat a skillet over medium heat and cook the chicken for 6-7 minutes per side until the internal temperature reaches 165°F, then shred it using two forks.
In a small mixing bowl, whisk together the Greek yogurt, lemon juice, dried dill, and the remaining salt and pepper to create the ranch dressing.
Once the potato is finished, slice it down the center and gently fluff the interior with a fork.
Stuff the shredded chicken into the potato, top with the shredded cheddar cheese, and return to the oven for 2-3 minutes until the cheese is melted.
Drizzle the yogurt ranch dressing over the top and garnish with sliced green onions before serving warm.