Preheat your oven to 400°F and line a large baking sheet with parchment paper.
In a large bowl, toss the cubed sweet potatoes and broccoli florets with 1 teaspoon of olive oil and half of the salt, pepper, and garlic powder.
Spread the vegetables in a single layer on the baking sheet and roast for 20-25 minutes until the potatoes are tender and the broccoli edges are charred.
Pat the sirloin steak dry with a paper towel and season both sides evenly with the remaining salt, pepper, garlic powder, and smoked paprika.
Heat the remaining 1 teaspoon of olive oil in a cast-iron skillet over medium-high heat until it begins to shimmer.
Place the steak in the hot skillet and sear for 3-4 minutes per side for medium-rare, ensuring a deep golden-brown crust forms.
Remove the steak from the pan and let it rest on a cutting board for 5 minutes to allow the juices to redistribute.
Slice the steak against the grain and serve immediately alongside the crispy roasted sweet potatoes and broccoli.