In a 13x9-in. baking dish coated with cooking spray, combine the chicken, tomatoes, onion and peppers. Combine the oil, chili powder, cumin and salt. Drizzle over chicken mixture; toss to coat. , Bake, uncovered, at 400° for 20-25 minutes or until chicken is no longer pink and vegetables are tender. Spoon onto tortillas; fold or roll tortillas to serve. Serve with toppings as desired.