Preheat your oven to 400°F (200°C). Scrub the russet potato thoroughly and prick it 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 to 60 minutes until the skin is crisp and the center is soft.
While the potato is roasting, heat a non-stick skillet over medium heat and add the ground turkey, breaking it apart with a spatula.
Season the turkey with garlic powder, sea salt, and black pepper, cooking until it is browned and fully cooked through.
Add the fresh spinach to the skillet with the turkey and stir for 1 to 2 minutes until the leaves are just wilted, then remove from the heat.
Once the potato is finished, slice it open lengthwise and use a fork to gently fluff the inside.
Stuff the potato with the ground turkey and spinach mixture, then top with a generous dollop of Greek yogurt, shredded cheddar cheese, and sliced green onions.