- Thicken Sauce: Sprinkle the flour over the caramelized onions and garlic, and cook for another minute, stirring constantly. Gradually pour in the broth while stirring, and let the mixture simmer for a couple of minutes until slightly thickened.
- Combine Ingredients: Return the chicken breasts to the skillet, nestling them into the onion mixture. Spoon some of the onion mixture over the chicken.
- Add Cheese: Sprinkle the shredded Gruyere (or Swiss) cheese and Parmesan cheese over the top of each chicken breast.
- Bake: Transfer the skillet to the preheated oven and bake for about 20-25 minutes, or until the chicken is cooked through and the cheese is melted and bubbly.
- Serve: Once done, remove the skillet from the oven. Garnish with fresh thyme leaves if desired. Serve the French Onion Chicken Bake hot, with the onion mixture spooned over the chicken.
Enjoy your French Onion Chicken Bake! It pairs well with mashed potatoes, rice, or crusty bread to soak up the flavorful sauce
