Preheat your oven to 400°F (200°C). Scrub the Russet potato clean and pierce it several times with a fork.
Place the potato directly on the oven rack and bake for 45-50 minutes, or until the skin is slightly crisp and the inside is tender.
While the potato bakes, heat the olive oil in a non-stick skillet over medium-high heat. Add the ground turkey, diced onion, and diced bell pepper.
Sauté the turkey mixture, breaking it up with a spatula, until the meat is browned and the vegetables are softened.
Stir in the chili powder, cumin, sea salt, and black pepper. Cook for another 2 minutes to toast the spices, then remove from heat.
Once the potato is done, remove it from the oven and let it cool slightly. Slice it in half lengthwise.
Scoop out most of the potato flesh, leaving about a 1/4-inch thick shell (save the scooped potato for another meal).
Place the potato shells back on a baking sheet, skin-side up, and bake for 5 minutes. Flip them over and bake for another 5 minutes until the edges are golden and crispy.
Divide the turkey chili mixture evenly between the two potato shells and sprinkle with the shredded sharp cheddar cheese.
Return to the oven for 2-3 minutes until the cheese is melted and bubbly.
Top each potato skin with a dollop of Greek yogurt and a sprinkle of fresh chives before serving.