Start by preheating your oven to 425°F for the asparagus and sweet potato.
Season the sirloin steak generously with salt, pepper, and a light dusting of garlic powder on both sides.
Heat a non-stick skillet over medium-high heat and add the olive oil. Once hot, sear the steak for about 3-4 minutes per side for medium-rare, or adjust time based on your preferred doneness.
While the steak is searing, place the asparagus on a baking sheet. Drizzle lightly with olive oil, and season with salt and pepper.
Thinly slice the sweet potato into rounds. Arrange them on a separate portion of the baking sheet, season lightly, and avoid overcrowding to ensure they get crispy.
Roast both the asparagus and sweet potato in the preheated oven. The asparagus should take about 10-12 minutes until tender yet crisp, and the sweet potato slices about 15 minutes until crispy, turning them once during cooking.
Once everything is cooked, plate the steak with a side of roasted asparagus and crispy sweet potato. Let the steak rest for a minute before slicing and serving.