teaspoon cornstarch; stir until smooth. add remaining broth to pan; bring to a boil. cook until reduced by half (about 5 minutes) then stir in flour mixture; cook 1 minute or until slightly thick, stirring frequently.
remove from heat; stir in remaining tablespoons butter and citrus juices. place 1 chicken breast half on each of 4 plates; top each serving with about 2 tablespoons sauce. sprinkle each serving with about 2 teaspoons parsley. 