Melt margarine in 5-quart saucepot over medium heat and cook onions covered, stirring frequently, until onions are caramelized, about 15 minutes. Stir in wine and cook 1 minute. Stir in broth and Knorr® Pasta Sides™ - Butter & Herb; heat through.
Meanwhile, line broiler pan with aluminum foil. Arrange bread on pan, then top with cheese. Broil 1 minute or until melted.