Preheat oven to 425 degrees. Place sweet potatoes in a large bowl. Drizzle with olive oil and toss to coat.
In a small bowl, combine salt, onion powder, garlic powder, paprika, cayenne and brown sugar. Sprinkle over the sweet potatoes and toss to distribute evenly. Pour onto a rimmed baking sheet. Bake for 15 minutes. Flip and bake 10 minutes.