In a large skillet, combine the chicken, 1/4 cup butter, hot sauce, barbecue sauce and chili powder. Cook, uncovered, over low heat for 5 minutes or until heated through.
Meanwhile, in a small bowl, combine the garlic, parsley and remaining butter; spread over cut sides of buns. Place on a baking sheet; broil 8 in. from the heat for 3-5 minutes or until lightly browned.
Spoon chicken mixture onto bun bottoms; top with lettuce, celery, salt, pepper, tomatoes and salad dressing. Replace bun tops. Yield: 4 servings.