In a large saucepan, combine brown sugar and cornstarch. Stir in the pineapple, soy sauce, garlic salt and ginger. Cook and stir over low heat until thickened.
Place chicken in a greased 9-in. square baking dish. Pour half of the sauce over chicken. Bake, uncovered, at 350° for 15 minutes. Bake 10 minutes longer or until a thermometer reads 170°, basting several times with the remaining sauce. Sprinkle with chives if desired.