SAUTE onions in hot oil in large skillet on medium heat 1 min. or until lightly browned. Stir in wine; cook until reduced by half.
ADD cream cheese and stock; cook until cream cheese is melted, stirring occasionally. Stir in pasta, salmon, tomatoes, yellow peppers, capers and mustard; cook 3 to 5 min. or until heated through.
STIR in herbs. Season with salt and black pepper.