This Chicken French Onion took a long time to make. Spent 40 minutes caramelizing the onions. Added a splash of balsamic vinegar (they key to the entire meal as far as I’m concerned) right as they finished. Cooked it down some more. Removed the onions, added the chicken to cook, removed the breasts, added beef broth which was heated with flour to thicken. Once it became the consistency of a sauce, added it all back to the pan and topped with Swiss cheese.