Preheat oven to 425°F.
Roast the sweet potatoes: Toss diced sweet potatoes with olive oil, paprika, garlic powder, onion powder, salt, and pepper. Spread evenly on a baking sheet and roast for 25–30 minutes, flipping halfway, until tender and slightly crispy.
Cook the steak: Season steak generously and let it sit at room temp for ~10 minutes. Grill or pan-sear over medium-high heat to preferred doneness. Let rest 5 minutes, then slice thinly against the grain.
Make the dressing: Whisk together olive oil, balsamic, Dijon, honey, salt, and pepper until smooth.
Assemble the salad: Add arugula to a large bowl or plate. Top with roasted sweet potatoes, steak, tomatoes, roasted red peppers, green onions, and feta.
Finish: Drizzle with dressing and serve immediately.