Heat oil in medium skillet over medium-high heat. Sprinkle chicken with oregano and salt. Add chicken; cook 12 to 15 minutes or until no longer pink in centers (165°F), turning once.
Meanwhile, stir together juice, cornstarch and brown sugar in microwave-safe 1-cup measure or small bowl until blended; add cranberries. Microwave on HIGH 3 minutes or until sauce boils and thickens, stirring after every minute. Serve sauce with chicken.