Preheat your oven to 400°F (200°C).
Scrub the Russet potato thoroughly, prick it several times with a fork, and place it directly on the oven rack to bake for 45-50 minutes until tender.
While the potato is roasting, heat the olive oil in a medium skillet over medium-high heat.
Add the diced yellow onion and red bell pepper to the skillet, sautéing for 3-5 minutes until the vegetables are softened and translucent.
Add the ground beef to the skillet, breaking it apart with a wooden spoon.
Season the beef mixture with sea salt, black pepper, and garlic powder, cooking until the meat is fully browned and no pink remains.
Once the potato is finished baking, remove it from the oven and slice it down the center lengthwise.
Use a fork to gently fluff the interior of the potato, then generously stuff the beef and pepper mixture into the center.
Sprinkle the shredded sharp cheddar cheese over the top and return the potato to the oven for 2-3 minutes until the cheese is bubbly and melted.
Garnish with freshly sliced green onions and serve warm.