Preheat your oven to 400°F. Scrub the Russet potato thoroughly and pierce the skin several times with a fork.
Place the potato directly on the oven rack and bake for 45-50 minutes, or until the center is tender when pierced with a knife.
While the potato is baking, heat the avocado oil in a medium skillet over medium-high heat. Add the ground turkey and cook, breaking it into small crumbles, until fully browned.
Stir the tomato paste, chili powder, cumin, garlic powder, and sea salt into the turkey. Add the black beans and a splash of water, then 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 and scoop out most of the flesh, leaving about a quarter-inch thick shell.
Spoon the turkey chili mixture evenly into the two potato shells, pressing down slightly to pack the filling.
Top each filled skin with the shredded sharp cheddar cheese and return them to the oven for 3-5 minutes, or until the cheese is melted and bubbly.
Garnish each potato skin with a dollop of Greek yogurt and a sprinkle of sliced green onions before serving.