1. Mix together garlic salt, mushroom powder, dry mustard, and pepper; pat on both sides of chicken parts. In baking pan, arrange chicken, skin side up.
2. Place in 400 degree oven and cook for 15 minutes. Remove chicken from oven and pour lemon-chives mixture over chicken.
3. Reduce temperature to 300 degrees, return chicken to oven and continue cooking until fork can be inserted in chicken with ease, about 45 minutes.
4. Baste with pan juice at least once during final cooking. Serve hot or refrigerate and serve cold.