Preheat your oven to 400°F. Scrub the Russet potatoes thoroughly and prick them several times with a fork.
Place the potatoes directly on the oven rack and bake for 45-50 minutes until the centers are tender.
While the potatoes are baking, heat the olive oil in a skillet over medium heat and sauté the diced yellow onion until translucent.
Add the ground turkey to the skillet, breaking it apart with a spatula until fully browned and cooked through.
Stir in the tomato puree, chili powder, cumin, garlic powder, sea salt, and black pepper. Simmer for 5 minutes until the chili thickens.
Remove potatoes from the oven and slice them in half lengthwise. Scoop out most of the flesh, leaving a 1/4-inch thick shell.
Place the potato shells on a baking sheet, fill each with the turkey chili mixture, and sprinkle evenly with shredded cheddar cheese.
Return the skins to the oven for 5-8 minutes until the cheese is bubbly and the edges of the skins are crisp.
Top each potato skin with a dollop of Greek yogurt and a sprinkle of fresh green onions before serving.