Preheat oven to 425 degrees F. In a small bowl combine maple syrup, 1 tsp. of the oil, the thyme, ¼ tsp. of the salt, and ¼ tsp. of the pepper. In a large bowl combine sweet potatoes and Brussels sprouts. Drizzle with the remaining 1 tbsp. oil and sprinkle with the remaining ¼ tsp. salt and ¼ tsp. pepper; toss to coat.
Line a 15x10-inch baking pan with foil. Heat the prepared pan in oven 5 minutes. Remove pan from oven and coat with cooking spray. Arrange chicken, meaty sides down, in center of pan. Arrange vegetables around chicken. Roast 15 minutes.
Turn chicken and vegetables; brush with maple syrup mixture. Roast 15 minutes more or until chicken is done (at least 175 degrees F) and potatoes are tender. Serve topped with pecans and cranberries.
