Preheat your oven to 400°F (200°C).
Scrub the Russet potato thoroughly, pierce it several times with a fork, and rub the skin with olive oil and a pinch of sea salt.
Place the potato directly on the oven rack and bake for 45-50 minutes until the skin is crisp and the inside is tender.
While the potato bakes, brown the ground turkey in a non-stick skillet over medium-high heat until fully cooked, breaking it into small crumbles.
Remove the potato from the oven and slice it in half lengthwise. Scoop out the warm potato flesh into a mixing bowl, leaving a 1/4-inch thick shell.
Mash the potato flesh with the Greek yogurt, cooked turkey, garlic powder, remaining sea salt, and black pepper until creamy.
Spoon the mixture back into the potato shells, mounding it slightly, and top with the shredded sharp cheddar cheese.
Place the boats on a baking sheet and return to the oven for 5-8 minutes until the cheese is melted and bubbly.
Garnish with freshly sliced green onions and serve immediately.