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 crisp and the inside is tender.
While the potato bakes, heat the olive oil in a medium skillet over medium heat and sauté the diced onion until translucent.
Add the ground turkey to the skillet, breaking it up with a spatula, and season with chili powder, sea salt, and black pepper.
Once the turkey is browned, stir in the tomato puree and simmer for 5 minutes until the chili has thickened.
Remove the baked potato from the oven and slice it in half lengthwise. Scoop out most of the flesh, leaving about a quarter-inch layer attached to the skin.
Place the potato skins on a parchment-lined baking sheet, fill them generously with the turkey chili, and sprinkle the shredded cheddar cheese over the top.
Return the skins to the oven for 5-8 minutes until the cheese is bubbly and melted.
Serve the potato skins hot with a dollop of plain Greek yogurt on top.