Preheat your oven to 400°F and line a small baking sheet with parchment paper.
Scrub the Russet potato thoroughly and prick the skin several times with a fork to allow steam to escape.
Rub the potato skin with avocado oil and a pinch of sea salt, then place it directly on the oven rack to bake for 45 to 50 minutes until tender.
While the potato is roasting, heat a non-stick skillet over medium heat and add the ground turkey.
Cook the turkey until browned and fully cooked through, breaking it into small crumbles with a spatula.
Season the turkey with garlic powder, sea salt, and black pepper, then stir in the fresh spinach until it is just wilted.
Remove the potato from the oven and let it cool for a few minutes before slicing it in half lengthwise.
Carefully scoop out the majority of the potato flesh, leaving about a quarter-inch layer against the skin to maintain the boat shape.
Pack the turkey and spinach mixture tightly into the hollowed-out potato skins.
Place the loaded boats back onto the baking sheet and roast for an additional 5 minutes to crisp the edges.
Remove from the oven and top each boat with a generous dollop of nonfat Greek yogurt.
Garnish with freshly chopped chives and serve immediately while hot.