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Dinner / French Onion Chicken Casserole: A Deliciously Easy Recipe for Comfort Food Lovers

French Onion Chicken Casserole: A Deliciously Easy Recipe for Comfort Food Lovers

April 18, 2025 by ChloeDinner

French Onion Chicken Casserole is a delightful dish that brings together the rich flavors of caramelized onions and tender chicken, all enveloped in a creamy, cheesy sauce. This comforting casserole is not just a meal; it’s a warm hug on a plate, perfect for family gatherings or a cozy weeknight dinner. The origins of French onion soup date back to the 18th century, but this casserole takes that classic flavor profile and transforms it into a hearty, satisfying dish that everyone can enjoy.

People love French Onion Chicken Casserole for its incredible taste and texture. The combination of savory onions, juicy chicken, and gooey cheese creates a symphony of flavors that dance on your palate. Plus, it’s incredibly convenient to prepare, making it an ideal choice for busy weeknights. I can’t wait to share this recipe with you, so you can experience the joy of French Onion Chicken Casserole in your own kitchen!

French Onion Chicken Casserole

Ingredients:

  • 4 boneless, skinless chicken breasts
  • 2 large onions, thinly sliced
  • 3 tablespoons olive oil
  • 1 teaspoon salt
  • 1/2 teaspoon black pepper
  • 1 teaspoon garlic powder
  • 1 teaspoon dried thyme
  • 1 cup beef broth
  • 1 cup heavy cream
  • 1 cup shredded Gruyère cheese
  • 1 cup French bread crumbs
  • 1 tablespoon fresh parsley, chopped (for garnish)

Preparing the Chicken

1. Start by preheating your oven to 375°F (190°C). This will ensure that your casserole cooks evenly and thoroughly. 2. While the oven is heating, take your boneless, skinless chicken breasts and season them with salt, black pepper, garlic powder, and dried thyme. Make sure to rub the seasonings into the chicken for maximum flavor. 3. In a large skillet, heat 2 tablespoons of olive oil over medium-high heat. Once the oil is hot, add the seasoned chicken breasts. Sear them for about 5-7 minutes on each side until they are golden brown. You don’t need to cook them all the way through, as they will finish cooking in the oven. 4. Once the chicken is browned, remove it from the skillet and set it aside on a plate. Cover it with aluminum foil to keep it warm.

Caramelizing the Onions

5. In the same skillet, add the remaining tablespoon of olive oil. Toss in the thinly sliced onions. Stir them occasionally, allowing them to cook down and caramelize. This process should take about 15-20 minutes. You want them to be soft and golden brown, which will add a rich flavor to your casserole. 6. Once the onions are caramelized, pour in the beef broth. Scrape the bottom of the skillet with a wooden spoon to deglaze it, incorporating all those delicious brown bits into the broth. Let it simmer for about 5 minutes, allowing the flavors to meld together. 7. After simmering, stir in the heavy cream. Mix well and let it cook for an additional 2-3 minutes until the sauce thickens slightly. Remove the skillet from heat.

Assembling the Casserole

8. In a large casserole dish, place the seared chicken breasts in a single layer. Make sure they are evenly spaced out. 9. Pour the caramelized onion and cream mixture over the chicken, ensuring that each piece is well-coated. The creamy sauce will keep the chicken moist and flavorful. 10. Now, sprinkle the shredded Gruyère cheese evenly over the top of the casserole. This cheese will melt beautifully and create a deliciously gooey topping. 11. Finally, add the French bread crumbs on top of the cheese. This will create a lovely crunchy texture once baked. If you want an extra layer of flavor, you can mix a little bit of melted butter into the bread crumbs before sprinkling them on top.

Baking the Casserole

12. Cover the casserole dish with aluminum foil to prevent the top from browning too quickly. Place it in the preheated oven and bake for 25 minutes. 13. After 25 minutes, remove the foil and continue baking for an additional 15-20 minutes, or until the cheese is bubbly and golden brown, and the chicken is cooked through (the internal temperature should reach 165°F or 74°C). 14. Once done, remove the casserole from the oven and let it sit for about 5-10 minutes. This resting time allows the sauce to thicken a bit more and makes it easier to serve.

Serving the Casserole

15. To serve, use a large spoon to scoop out portions of the casserole. Make sure to get a bit of chicken, sauce, and the crunchy topping in each serving. 16. Garnish with freshly chopped parsley for a pop of color and added freshness. This will not only enhance the presentation but also add a nice herbal note to the dish. 17. Pair your French Onion Chicken Casserole with a simple green salad or some steamed vegetables for a complete meal. The creamy, savory flavors of the casserole are sure to be a hit with family and friends! Enjoy your delicious French Onion Chicken Casserole! It’s a comforting dish that’s perfect for any occasion, and I’m sure you’ll love how easy it is to prepare. French Onion Chicken Casserole

Conclusion:

In summary, this French Onion Chicken Casserole is an absolute must-try for anyone looking to elevate their weeknight dinners with a dish that is both comforting and packed with flavor. The combination of tender chicken, rich caramelized onions, and gooey cheese creates a symphony of tastes that will have your family and friends coming back for seconds. Plus, it’s incredibly easy to prepare, making it perfect for busy evenings when you want something delicious without spending hours in the kitchen. For serving suggestions, consider pairing this casserole with a simple green salad or some crusty bread to soak up the delicious sauce. If you’re feeling adventurous, you can also experiment with variations by adding vegetables like mushrooms or bell peppers, or even swapping out the chicken for a hearty beef or vegetarian option. The possibilities are endless! I wholeheartedly encourage you to give this French Onion Chicken Casserole a try. I promise you won’t be disappointed! Once you’ve made it, I’d love to hear about your experience. Share your thoughts, any tweaks you made, or even a photo of your creation. Let’s spread the love for this delightful dish together! Happy cooking! Print
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French Onion Chicken Casserole: A Deliciously Easy Recipe for Comfort Food Lovers


  • Author: Dottie
  • Total Time: 65 minutes
  • Yield: 4 servings 1x
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Description

Savor the deliciousness of this French Onion Chicken Casserole, featuring juicy chicken breasts in a creamy onion sauce, topped with melted Gruyère cheese and crispy bread crumbs. It’s a comforting dish perfect for family meals or gatherings!


Ingredients

Scale
  • 4 boneless, skinless chicken breasts
  • 2 large onions, thinly sliced
  • 3 tablespoons olive oil
  • 1 teaspoon salt
  • 1/2 teaspoon black pepper
  • 1 teaspoon garlic powder
  • 1 teaspoon dried thyme
  • 1 cup beef broth
  • 1 cup heavy cream
  • 1 cup shredded Gruyère cheese
  • 1 cup French bread crumbs
  • 1 tablespoon fresh parsley, chopped (for garnish)

Instructions

  1. Preheat your oven to 375°F (190°C).
  2. Season the chicken breasts with salt, black pepper, garlic powder, and dried thyme, rubbing the seasonings into the meat.
  3. In a large skillet, heat 2 tablespoons of olive oil over medium-high heat. Sear the chicken breasts for 5-7 minutes on each side until golden brown. Remove and cover with foil to keep warm.
  4. In the same skillet, add the remaining tablespoon of olive oil and the sliced onions. Cook, stirring occasionally, for 15-20 minutes until caramelized and golden brown.
  5. Pour in the beef broth, scraping the bottom of the skillet to deglaze. Simmer for 5 minutes.
  6. Stir in the heavy cream and cook for an additional 2-3 minutes until the sauce thickens slightly. Remove from heat.
  7. In a large casserole dish, place the seared chicken breasts in a single layer.
  8. Pour the caramelized onion and cream mixture over the chicken, ensuring each piece is well-coated.
  9. Sprinkle the shredded Gruyère cheese evenly over the top.
  10. Add the French bread crumbs on top of the cheese. Optionally, mix melted butter into the bread crumbs for extra flavor.
  11. Cover the casserole with aluminum foil and bake for 25 minutes.
  12. Remove the foil and bake for an additional 15-20 minutes, or until the cheese is bubbly and golden brown, and the chicken reaches an internal temperature of 165°F (74°C).
  13. Let the casserole sit for 5-10 minutes before serving.
  14. Serve portions with a large spoon, ensuring to include chicken, sauce, and topping in each serving.
  15. Garnish with freshly chopped parsley and enjoy with a green salad or steamed vegetables.

Notes

  • For added flavor, consider mixing a bit of melted butter into the bread crumbs before sprinkling them on top.
  • This casserole can be prepared ahead of time and baked just before serving.
  • Prep Time: 15 minutes
  • Cook Time: 50 minutes

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