Preheat your oven to 400°F.
Scrub the Russet potato thoroughly, pierce it several times with a fork, and bake directly on the oven rack until tender, approximately 50 minutes.
While the potato bakes, brown the ground turkey in a non-stick skillet over medium heat until no pink remains.
Stir the black beans, tomato sauce, chili powder, cumin, garlic powder, sea salt, and black pepper into the skillet; simmer for 5 minutes until the mixture has thickened.
Once the potato is cool enough to handle, slice it in half lengthwise and scoop out the flesh, leaving a 1/4-inch thick shell.
Lightly brush the inside and outside of the potato skins with olive oil and bake them cut-side up for 10 minutes until the edges are golden and crisp.
Spoon the turkey chili mixture into the potato skins and sprinkle the shredded sharp cheddar cheese evenly over the top.
Return the loaded skins to the oven for 3-5 minutes until the cheese is melted and bubbly.
Garnish each skin with a dollop of Greek yogurt and sliced green onions before serving.