Preheat your oven to 400°F (200°C). Scrub the Russet potato thoroughly and pierce it several times with a fork.
Place the potato directly on the oven rack and bake for 45 to 50 minutes, or until the skin is slightly wrinkled and the inside is tender.
While the potato bakes, place a skillet over medium heat and add the ground turkey. Cook until browned, breaking it into small crumbles with a spatula.
Stir in the tomato paste, chili powder, cumin, garlic powder, sea salt, and black pepper. Add 2 tablespoons of water and simmer for 5 minutes until the mixture is thick and fragrant.
Remove the potato from the oven and let it cool slightly. Slice it in half lengthwise.
Scoop out most of the potato flesh, leaving about 1/4-inch of potato attached to the skin to create a sturdy shell (save the scooped potato for another use).
Brush the inside and outside of the potato skins with olive oil. Place them cut-side down on a baking sheet and bake for 5 to 7 minutes until the edges are golden and crispy.
Flip the skins over and fill each cavity with the turkey chili mixture. Sprinkle the shredded cheddar cheese evenly over the top.
Return to the oven for 2 to 3 minutes, or until the cheese is bubbling and melted.
Remove from the oven and top each potato skin with a dollop of Greek yogurt and a sprinkle of sliced green onions before serving.