Preheat your oven to 400°F and line a small baking sheet with parchment paper.
Scrub the potato clean, prick it several times with a fork, and bake for 45-50 minutes until tender.
While the potato bakes, heat the olive oil in a skillet over medium heat and brown the ground turkey until fully cooked.
Add the finely chopped broccoli to the skillet with the turkey, seasoning with salt, pepper, and garlic powder, and sauté for 3-4 minutes until the broccoli is bright green.
Once the potato is cool enough to handle, slice it in half lengthwise and scoop out most of the flesh, leaving a thin layer against the skin.
In a small bowl, mix the scooped potato flesh with the Greek yogurt until smooth, then fold in the turkey and broccoli mixture.
Spoon the filling back into the potato skins, sprinkle with shredded cheddar cheese, and return to the oven for 5 minutes until the cheese is bubbly.
Garnish with sliced green onions and serve immediately.