In a large resealable plastic bag, combine 1/2 cup buttermilk and pepper sauce; add chicken. Seal bag and turn to coat; refrigerate for 30 minutes.
For dipping sauce, in a small bowl, combine 2 tablespoons Parmesan cheese, mayonnaise, sour cream, lemon juice, onion powder, garlic powder and remaining buttermilk until blended. Cover and refrigerate until serving.
In another resealable plastic bag, combine bread crumbs and remaining Parmesan cheese. Drain and discard marinade. Add chicken to crumb mixture; seal bag and shake to coat.
Place chicken in a greased 15-in. x 10-in. x 1-in. baking pan. Bake at 450° for 15 minutes or until juices run clear. Serve with dipping sauce. Yield: 4 servings.