Preheat your oven to 400°F (200°C).
Wash and dice the Yukon Gold potatoes into 1/2-inch cubes.
In a bowl, toss the potatoes with half of the olive oil and a pinch of the salt and pepper.
Spread the potatoes in a single layer on a parchment-lined baking sheet and roast for 20-25 minutes until golden and crispy.
While potatoes roast, pat the steak dry with a paper towel and season both sides with the remaining salt and pepper.
Heat a cast-iron skillet over medium-high heat with the remaining olive oil.
Once the skillet is hot, sear the steak for 3-4 minutes per side for medium-rare, or until it reaches your desired doneness.
In the final minute of searing, add the minced garlic and fresh rosemary to the pan to infuse the steak with flavor.
Remove the steak from the skillet and let it rest on a cutting board for at least 5 minutes.
Add the asparagus spears to the same hot skillet and sauté for 3-4 minutes until tender-crisp and bright green.
Slice the steak against the grain and serve alongside the roasted potatoes and sautéed asparagus.