This French onion chicken brings together tender baked chicken breasts, deeply caramelized onions, and melted Gruyère cheese for a rich, comforting dinner.
In a skillet over medium heat, melt the butter. Add the sliced onions and sauté until soft and caramelized, about 15-20 minutes.
Pour in the beef broth during the last few minutes of cooking, allowing the onions to absorb the broth and form a rich, flavorful mixture.
Place the chicken breasts in a 9x13 baking dish. Season the chicken evenly with salt, thyme, and pepper. Spoon the caramelized onions over the chicken, ensuring the breasts are well covered.
Transfer the dish to the preheated oven and bake for 20 minutes, or until the chicken reaches an internal temperature of 165°F.
Remove the dish from the oven and sprinkle the shredded Gruyere evenly over the chicken and onions. Return to the oven and bake for an additional 5-10 minutes until the cheese is melted and bubbly. For a crispier topping, broil for the last 2-3 minutes, watching closely to prevent burning.