In large plastic or brown bag, combine flour and next five ingredients. Sprinkle chicken on all sides with Seasoning Salt; shake chicken pieces in the seasoned flour and lay on waxed paper while oil is heating. In 12-inch/30-cm skillet, heat oil and butter over medium-high heat until hot. Carefully add chicken, skin side down; cook until golden brown, about 10 minutes per side. Drain on paper towels. (Keep warm, if desired.) Repeat with remaining chicken. Serve hot or at room temperature.