In large bowl, mix 1 tablespoon of the oil, the Brussels sprouts, 1/4 teaspoon of the salt and 1/4 teaspoon of the pepper. Place on sheet pan. In same bowl, mix 2 teaspoons of the oil, the sweet potato, red onions, remaining 1/4 teaspoon salt and remaining 1/4 teaspoon pepper. Place on sheet pan with sprouts. Roast 10 minutes.