Preheat your oven to 400°F (200°C).
Scrub the Russet potato clean, pierce it several times with a fork, and bake directly on the oven rack for 45-55 minutes until the center is soft and the skin is crisp.
While the potato is baking, cook the bacon slice in a small skillet over medium heat until crispy; remove, drain on a paper towel, and crumble into small pieces.
Pat the sirloin steak dry with paper towels. In a small bowl, mix the sea salt, black pepper, rosemary, and thyme, then rub the mixture and the olive oil onto both sides of the steak.
Heat the same skillet used for the bacon over medium-high heat. Sear the steak for 3-5 minutes per side, depending on your preferred level of doneness.
Transfer the steak to a cutting board and let it rest for 5 minutes before slicing it against the grain.
Once the potato is finished, slice it open lengthwise and fluff the interior with a fork. Top with shredded cheddar cheese, Greek yogurt (as a high-protein sour cream substitute), crumbled bacon, and sliced green onions.