French Onion Chicken Bake

Indulge in the rich and savory delight of French Onion Chicken Bake, a recipe that elegantly combines the classic flavors of French onion soup with succulent chicken. This dish starts by caramelizing onions to a sweet and tender perfection, enhanced with a splash of balsamic vinegar and a savory touch of low sodium beef broth. These golden onions form the first layer in your baking dish, setting the stage for the main attraction: juicy boneless, skinless chicken breasts.

Seasoned simply with salt and pepper, the chicken is nestled on top of the onions, absorbing the flavors as it cooks. The magic happens with the addition of two types of cheese – a hearty sprinkle of Parmesan and a generous layer of mozzarella – each contributing its unique texture and flavor. As this ensemble bakes in the oven, the cheeses melt and mingle with the onion mixture, creating a deliciously gooey topping that complements the tender chicken.

The result is a harmonious blend of flavors and textures, from the sweet caramelized onions to the rich, gooey cheese and the moist, flavorful chicken. This French Onion Chicken Bake is more than just a meal; it’s a comforting and satisfying experience, perfect for a cozy family dinner or a special gathering. Serve it warm, and watch as it becomes a new favorite, requested time and again for its delightful taste and homey appeal.


  • 4 tablespoons Butter: Unsalted butter is preferable for controlling the salt content of the dish.
  • 2 tablespoons Balsamic Vinegar: Adds a sweet and tangy flavor, enhancing the caramelization of the onions.
  • 2/3 cup Low Sodium Beef Broth: This helps in creating a rich base for the onion mixture. Low sodium broth keeps the dish healthier.
  • 4 Onions: Preferably large, peeled and thinly sliced. Yellow onions are ideal for their balance of sweetness and sharpness.
  • 1 cup Mozzarella Cheese: Shredded. It adds a gooey, creamy texture and mild flavor.
  • 4 Chicken Breasts: Boneless and skinless, providing a lean protein source.
  • 1/2 cup Parmesan Cheese: Shredded. Offers a nutty and salty flavor that complements the mozzarella.
  • 1/2 teaspoon Pepper: Freshly ground black pepper is recommended for the best flavor.
  • 1/2 teaspoon Salt: Adjust to taste, especially if using unsalted butter.
  • 4 cloves Garlic: Minced. Adds a pungent and spicy flavor, enhancing the overall taste.
  • 1 teaspoon Thyme: Fresh or dried. It gives an earthy and slightly minty flavor.


  1. Oven Preparation: Start by preheating your oven to 200 degrees Celsius (400 degrees Fahrenheit). This high temperature is essential for baking the chicken thoroughly and melting the cheese to a golden perfection.
  2. Baking Dish Prep: Use a cooking spray to lightly coat a baking dish. This prevents sticking and ensures easy serving and cleaning.
  3. Sauté Onions: In a large skillet over medium-high heat, melt the butter. Add the sliced onions and sauté until they start to soften. This process helps to bring out the natural sweetness of the onions.
  4. Flavoring the Onions: Reduce the heat to medium-low. Add minced garlic, pepper, and thyme to the onions. Continue to sauté until the mixture is fragrant. This step infuses the onions with the aromatic flavors of garlic and herbs.
  5. Deglaze with Vinegar and Broth: Pour in the balsamic vinegar and beef broth. Stir well, making sure to scrape up the browned bits from the bottom of the skillet. These bits add a depth of flavor to the dish. Simmer for about 10 minutes, or until the onions have caramelized into a rich, deep brown mixture.
  6. Assemble the Dish: Spread one-third of the onion mixture evenly in the prepared baking dish. Place the chicken breasts over this layer, and season them with salt. Top the chicken with the remaining onions.
  7. Add Cheese: Generously sprinkle both Parmesan and mozzarella cheese over the onions. This cheese layer will melt and brown in the oven, creating a delicious, bubbly topping.
  8. Baking: Bake in the preheated oven for approximately 30 minutes. The chicken should be cooked through (internal temperature of 165 degrees Fahrenheit or 75 degrees Celsius), and the cheese should be golden and bubbly.
  9. Rest and Serve: Let the dish rest for a few minutes after removing it from the oven. This allows the juices to redistribute throughout the chicken, ensuring that each bite is moist and flavorful. Serve warm for a comforting and satisfying meal.

Enjoy your French Onion Chicken Bake! This dish pairs beautifully with a side of green vegetables or a simple salad to balance the richness of the cheese and caramelized onions.

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