Preheat your oven to 400°F (200°C).
Scrub the potato clean and pierce it several times with a fork. Rub the skin with 1 teaspoon of olive oil and a pinch of sea salt.
Bake the potato directly on the oven rack for 45 to 50 minutes, or until the skin is crisp and the inside is tender.
While the potato bakes, heat the remaining 1 teaspoon of olive oil in a skillet over medium heat and brown the ground turkey until fully cooked.
Season the turkey with garlic powder and black pepper, then stir in the fresh spinach until it is completely wilted.
Once the potato is done, slice it in half lengthwise and carefully scoop the flesh into a mixing bowl, leaving a thin shell of potato skin.
Mash the potato flesh with the Greek yogurt until creamy, then fold in the cooked turkey and spinach mixture.
Spoon the filling back into the potato skins, top with shredded cheddar cheese, and broil for 2 to 3 minutes until the cheese is bubbly.
Garnish with chopped green onions before serving.