Preheat your oven to 400°F (200°C).
Scrub the Russet potato thoroughly, pierce it several times with a fork, and bake for 45 to 50 minutes until the center is tender.
While the potato bakes, brown the ground turkey in a non-stick skillet over medium heat until fully cooked.
Stir in the tomato sauce, chili powder, ground cumin, garlic powder, sea salt, and black pepper, then simmer for 5 minutes to thicken.
Remove the baked potato from the oven and slice it in half lengthwise.
Scoop out most of the potato flesh, leaving a 1/4-inch thick shell to maintain structure.
Fill each potato shell evenly with the turkey chili mixture and top with the shredded sharp cheddar cheese.
Return the potatoes to the oven for 5 to 8 minutes until the cheese is bubbly and the skins are crisp.
Garnish each skin with a dollop of nonfat Greek yogurt and a sprinkle of sliced green onions before serving.