All you need for easy French Onion Soup are caramelized onions and McCormick® Au Jus Gravy Mix. Photo credit: Julie Deily from The Little Kitchen.
Melt butter in large saucepan on medium heat. Add onions; cook and stir 20 minutes or until golden brown. Add Gravy Mix and water.
Bring to boil on high heat. Reduce heat to low; cover and simmer 10 minutes, stirring occasionally. Serve with crusty bread topped with melted Swiss cheese, if desired.