Preheat your oven to 400°F and pierce the russet potato several times with a fork.
Bake the potato directly on the oven rack for 45-50 minutes until the skin is slightly crisp and the inside is tender.
While the potato bakes, sauté the diced yellow onion in a non-stick skillet over medium heat until translucent.
Add the ground turkey to the skillet, breaking it into small crumbles, and cook until no longer pink.
Stir in the tomato puree, chili powder, cumin, sea salt, and black pepper, then simmer for 5-7 minutes until the mixture thickens.
Once the potato is done, slice it in half lengthwise and scoop out the flesh, leaving about a quarter-inch of potato attached to the skin.
Brush the inside of the potato skins with olive oil and return them to the oven for 8 minutes to crisp up.
Divide the turkey chili mixture evenly between the two potato halves and top with the sharp cheddar cheese.
Bake for an additional 3-5 minutes until the cheese is melted and bubbling.
Garnish each potato skin with a dollop of non-fat Greek yogurt and a sprinkle of fresh chives before serving.