Preheat your oven to 400°F and line a small baking sheet with parchment paper.
Scrub the Russet potato thoroughly, pierce it several times with a fork, and bake for 45 to 60 minutes until the center is soft.
While the potato bakes, pat the sirloin steak dry with paper towels and season both sides evenly with sea salt, black pepper, and garlic powder.
Heat the ghee in a cast-iron skillet over medium-high heat until shimmering.
Place the steak in the skillet and sear for 3 to 4 minutes per side for a medium-rare finish, then transfer to a cutting board to rest for 5 minutes.
Steam the broccoli florets in a steamer basket over boiling water for 5 minutes until vibrant green and tender-crisp.
Slice the rested steak into thin strips or bite-sized cubes.
Slice the baked potato open lengthwise, fluff the interior with a fork, and layer the steak and steamed broccoli inside.
Top the potato with a dollop of plain Greek yogurt and a sprinkle of fresh chives before serving.