Preheat your oven to 400°F (200°C).
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 to 60 minutes until the skin is crisp and the center is soft.
While the potato is roasting, thinly slice the top sirloin steak into bite-sized strips.
Dice the red bell pepper and yellow onion into small pieces.
Heat the olive oil in a non-stick skillet over medium-high heat.
Add the steak strips to the skillet and season with sea salt, black pepper, and garlic powder.
Sear the steak for 2 minutes until browned, then toss in the peppers and onions.
Sauté the mixture for another 3 to 4 minutes until the vegetables are tender and the steak is cooked to your preference.
Once the potato is finished, slice it open lengthwise and fluff the interior with a fork.
Fill the potato cavity with the steak and vegetable mixture, then sprinkle the sharp cheddar cheese over the top.
Return the potato to the oven for 2 minutes or until the cheese is completely melted, then garnish with fresh chives.