Crumble sausage into a large saucepan; cook over medium low heat. Add onion; cook and stir until transparent. Drain, discarding all but 2 tbs. of drippings. Stir in flour; cook over medium low heat about 6 minutes or until mixture bubbles and turns golden. Stir in milk. Add seasonings; cook, stirring, until thickened. To serve, slice biscuits and spoon gravy over halves.