Preheat your oven to 400°F. Scrub the Russet potato clean, pierce it several times with a fork, and bake directly on the oven rack for 45-50 minutes until the center is tender.
While the potato bakes, place a non-stick skillet over medium-high heat. Add the ground turkey and cook, breaking it apart with a spatula, until it is fully browned and no longer pink.
Reduce the heat to low and stir in the tomato puree, chili powder, ground cumin, garlic powder, sea salt, and black pepper. Simmer the turkey mixture for 5 minutes to allow the flavors to meld, then remove from heat.
Once the potato is cool enough to handle, slice it in half lengthwise. Scoop out the fluffy white flesh, leaving about a 1/4-inch thick shell of potato against the skin (reserve the scooped potato for another use).
Brush the inside and outside of the potato skins lightly with the extra virgin olive oil. Place them hollow-side down on a baking sheet and bake for 5-7 minutes. Flip them over and bake for another 5 minutes until the edges are crispy and golden.
Divide the turkey chili mixture evenly between the two potato skin halves. Sprinkle the shredded sharp cheddar cheese over the top of each.
Return the loaded skins to the oven for 2-3 minutes, or until the cheese is melted and bubbling.
Remove from the oven and top each skin with a dollop of nonfat Greek yogurt and a sprinkle of sliced green onions before serving.