This French Onion Stuffed Chicken takes the classic French onion soup and turns it into one of our best stuffed chicken recipes. Stuffed with flavorful caramelized onion and a 3-cheese medley of gruyere, mozzarella, and parmesan, this juicy chicken was made to impress!

french onion stuffed chicken breast on a bed of white rice in a white bowl.

What’s in this French Onion Stuffed Chicken Recipe?

For all you French onion soup lovers out there, this one’s for you! This French onion stuffed chicken is arguably one of our greatest creations. It’s filled with sweet caramelized onions and glorious melted cheese that’s cooked in a savory chicken broth, making it the perfect main dish recipe to impress with minimal effort. 

  • Olive Oil: Helps the onions to caramelize without burning.
  • Unsalted Butter: Adds a rich flavor.
  • Onions: Caramelize to become a sweet, flavorful broth.
  • Spices: Dried thyme, kosher salt, and ground black pepper enhance the flavor of this chicken.
  • Chicken Broth: Helps to create a rich, flavorful broth.
  • Cheese: Gruyere, mozzarella, and Parmesan cheese make this chicken extra creamy and cheesy.
  • Chicken Breasts: I prefer to use boneless, skinless chicken breasts because they allow me to make the largest pocket.

Pro Tip: When seasoning the chicken, I usually use about one teaspoon of salt per pound of chicken.

Variations on a French Onion Stuffed Chicken Breast

This stuffed chicken dish is delicious as is, but you can also change up the taste to better meet your personal preferences.

Feel free to add some mushrooms in with the caramelized onions; swap out the cheeses for blue cheese, Swiss cheese, brie, or goat cheese; or even wrap the chicken breasts in bacon before baking to add an extra umami element!

step by step photos for how to make french onion stuffed chicken.
What kind of pan should I use for French onion stuffed chicken?

This recipe is going from the stovetop straight to the oven. So be sure you are using an oven-safe skillet. Cast iron is always a great option!

How do I make a pocket in a chicken breast to stuff it?

Use a sharp pairing knife to cut a pocket in the chicken. Be sure not to cut all the way through.

What kind of cheese should I use for French onion stuffed chicken?

We’re stuffing this chicken with a blend of gruyere, mozzarella, and Parmesan for that classic French onion soup flavor!

french onion stuffed chicken breasts in a cast iron pan.

How to Make Ahead and Store

You can make the caramelized onions up to 2 days in advance and store them in an airtight container in the refrigerator until ready to use.

You can fully assemble the stuffed chicken breasts up to 1 day in advance and store them tightly wrapped in plastic wrap in the refrigerator until ready to cook.

Store leftover French onion stuffed chicken in an airtight container in the refrigerator for up to 3 days.

How to Freeze and Reheat

Freeze French onion stuffed chicken breasts tightly wrapped in plastic wrap or in a freezer-safe Ziplock bag for up to 3 months.

Let thaw overnight in the refrigerator before reheating in the microwave or in a cast iron skillet set over medium-low heat until warmed through.

Serving Suggestions

Serve your french onion stuffed chicken over white rice, mashed potatoes, green beans, or any of your favorite neutral sides. Pretty much anything tastes delicious in this heavenly sauce!

You can even store any leftover juices to use as an au jus sauce for sandwiches or to cook with future recipes. 

overhead view of french onion chicken in a cast iron skillet.
french onion stuffed chicken breasts in a cast iron pan.

French Onion Stuffed Chicken Recipe

This French onion stuffed chicken recipe was made for fans of the classic French onion soup! It’s cheesy, oniony, and has the perfect balance of sweet and savory. Enjoy!

Instructions

  • Preheat oven to 350°F.

  • In a large oven-safe skillet set over medium-high heat, melt together 2 tablespoons of olive oil and all of the butter. Add the sliced onions, spreading them out in an even layer, and cook for 5 minutes until softened and lightly golden.

    ¼ cup olive oil, 2 tablespoons unsalted butter, 2-3 onions

  • Reduce the heat to medium and sprinkle the onions with thyme, salt, and pepper. Cover the pan and continue caramelizing them for another 15-20 minutes, stirring frequently, until the onions are a nice golden brown. If needed, add a bit of broth to the pan to keep the onions moist. Once onions are caramelized, transfer them to a bowl.

    1 teaspoon dried thyme, ½ teaspoon kosher salt, ½ teaspoon ground black pepper, ¾ cup low-sodium chicken broth

  • In a small bowl, combine the cheeses. Carefully, use a sharp knife to cut a large pocket into the fat side of the chicken breasts. Stuff each breast evenly with most of the cheeses and most of the onions, setting any remaining aside. Secure them with toothpicks.

    1 cup freshly shredded gruyere cheese, ½ cup freshly shredded mozzarella cheese, ⅓ cup freshly grated Parmesan cheese, 4 boneless, skinless chicken breasts

  • Return the skillet to medium-high heat and add the remaining olive oil. Season the chicken breasts with salt and pepper, then brown them on each side for 2-3 minutes until golden brown, flipping them carefully to keep the filling inside. Work in batches if necessary depending on the size of the chicken and the pan.

  • Add the remaining broth and onions to the skillet, nestling the chicken nicely inside. Bake the chicken for 15-18 minutes, until the internal temperature reaches 160°F. Remove the pan from the oven, sprinkle on the remaining cheese, and continue baking for another 3-6 minutes, until the cheese is melted and the chicken is 165°F. Broil for 1-2 minutes if desired.

  • Remove the skillet from the oven and allow the chicken to rest for several minutes before removing the toothpicks and serving over rice or potatoes with the pan juices.

    Fresh thyme

Notes

  • Use a sharp pairing knife to cut a pocket in the chicken. Be sure not to cut all the way through.
  • Don’t be shy with the cheese, but also don’t overstuff the cheese into the chicken breast pocket.
  • When seasoning the chicken, I usually use about one teaspoon of salt per pound of chicken.
  • To check the doneness of the chicken, use an instant-read meat thermometer. When it reaches 165°F degrees you’re good to plate up!
  • Garnish with fresh thyme for an extra pop of color.

Storage: Store French onion stuffed chicken in an airtight container in the refrigerator for up to 3 days or in the freezer for up to 3 months.

Nutrition Facts

French Onion Stuffed Chicken Recipe

Amount Per Serving

Calories 542
Calories from Fat 351

% Daily Value*

Fat 39g60%

Saturated Fat 16g100%

Trans Fat 0.2g

Polyunsaturated Fat 3g

Monounsaturated Fat 17g

Cholesterol 142mg47%

Sodium 908mg39%

Potassium 596mg17%

Carbohydrates 7g2%

Fiber 1g4%

Sugar 3g3%

Protein 41g82%

Vitamin A 700IU14%

Vitamin C 6mg7%

Calcium 506mg51%

Iron 1mg6%

* Percent Daily Values are based on a 2000 calorie diet.

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