Preheat your oven to 400°F (200°C).
Scrub the russet potato thoroughly, prick it several times with a fork, and rub the skin with olive oil and a pinch of sea salt.
Place the potato directly on the oven rack and bake for 45 to 60 minutes, or until the skin is crisp and the inside is tender when pierced with a knife.
While the potato is baking, heat a non-stick skillet over medium-high heat and add the ground turkey.
Cook the turkey, breaking it up with a spatula, until browned and cooked through.
Season the turkey with the remaining sea salt, black pepper, and garlic powder.
Add the fresh spinach to the skillet and stir for 1-2 minutes until the leaves are completely wilted and incorporated into the meat.
Once the potato is done, remove it from the oven and slice it lengthwise. Use a fork to gently fluff the interior flesh.
Spoon the turkey and spinach mixture generously into the potato cavity.
Top with a large dollop of plain Greek yogurt and garnish with freshly chopped chives before serving.