1. Preheat oven to 350 degrees Fahrenheit (175 degrees Celsius).
2. Arrange chicken pieces in a pan. Season with salt and pepper. Scatter mushrooms and pecans over the chicken.
3. In a small bowl, whisk together remaining ingredients; pour over the chicken.
4. Cover tightly. Bake for one and a half hours.
5. Uncover and baste. Raise oven temperature to 400 degrees Fahrenheit (200 degrees Celsius); bake uncovered for an additional 20 minutes, until browned.