To Make in Oven: Heat oven to 425°F. Place rack in large rimmed sheet pan. Spray rack and pan with cooking spray. In large bowl, mix oil, salt, garlic powder and ground red pepper. Add chicken; turn to coat. Place in single layer on rack in pan. Roast 33 to 38 minutes or until meat thermometer inserted in center of largest thigh reads 180°F and meat is tender enough to shred. Remove from oven; let rest until cool enough to handle, about 15 minutes. Shred chicken with 2 forks. Toss shredded chicken in pan liquid to coat.