Go Back
A close-up of French Onion Chicken in a light-colored skillet, with chicken breasts covered in melted cheese and rich onion gravy.

Rich and Comforting Skillet French Onion Chicken Recipe

This skillet recipe transforms ordinary chicken into a delectable, deeply flavorful meal reminiscent of classic French onion soup, featuring tender chicken breasts smothered in sweet caramelized onions, rich broth, and a melted blanket of Gruyère cheese.
Print Recipe Pin Recipe
Prep Time 20 minutes
Cook Time 45 minutes
Total Time 1 hour 5 minutes
Servings: 4 servings
Course: Main Course
Cuisine: American, French
Calories: 550
Ingredients Equipment Method Notes

Ingredients
  

For the Chicken
  • 4 large boneless, skinless chicken breasts patted dry
  • 1/2 tsp salt divided
  • 1/4 tsp black pepper divided
  • 1 tbsp olive oil
For the Caramelized Onions & Sauce
  • 2 tbsp unsalted butter
  • 3 large yellow onions thinly sliced
  • 1 tsp granulated sugar
  • 1/4 cup dry white wine e.g., Sauvignon Blanc or Pinot Grigio, optional, or use more broth
  • 2 cups beef broth low sodium
  • 1 tbsp all-purpose flour
  • 1 tsp fresh thyme chopped, or 1/2 tsp dried
  • 1 tbsp Worcestershire sauce
  • 1/2 tsp Dijon mustard
  • 1/4 tsp salt
  • 1/8 tsp black pepper
For the Topping
  • 1 cup Gruyère cheese shredded
  • 1/4 cup Parmesan cheese grated
  • 2 tbsp fresh parsley chopped, for garnish (optional)

Equipment

  • Large oven-safe skillet
  • Cutting Board
  • Sharp Knife
  • Spatula
  • Whisk

Method
 

Prepare the Chicken:
  1. Pat chicken breasts dry with paper towels. Season evenly with 1/4 tsp salt and 1/8 tsp black pepper. If chicken breasts are very thick, you can butterfly them or pound them slightly to an even thickness for faster cooking.
Caramelize the Onions:
  1. Heat 1 tbsp olive oil in a large oven-safe skillet over medium-low heat. Add sliced onions and granulated sugar. Cook, stirring occasionally, for 25-30 minutes, or until onions are deeply golden brown and very tender. If they start to stick, add a tablespoon of water or broth. Remove caramelized onions from the skillet and set aside.
Sear the Chicken:
  1. Increase heat to medium. Add 1 tbsp butter to the same skillet. Once melted, add the seasoned chicken breasts and sear for 3-4 minutes per side, until golden brown. The chicken does not need to be cooked through at this stage. Remove chicken from the skillet and set aside.
Build the Sauce:
  1. Reduce heat to medium-low. Add the remaining 1 tbsp butter to the skillet. Once melted, sprinkle in the flour and whisk constantly for 1 minute to create a roux.
  2. Slowly whisk in the white wine (if using), scraping up any browned bits from the bottom of the skillet. Bring to a simmer and cook for 1 minute.
  3. Gradually whisk in the beef broth, then stir in the fresh thyme, Worcestershire sauce, Dijon mustard, remaining 1/4 tsp salt, and remaining 1/8 tsp black pepper. Bring the sauce to a gentle simmer, stirring occasionally, until it thickens slightly, about 5-7 minutes.
Combine and Finish:
  1. Preheat your oven broiler. Return the caramelized onions to the skillet, stirring them into the sauce.
  2. Nest the seared chicken breasts into the sauce and onions. Spoon some of the sauce over the chicken.
  3. In a small bowl, combine the shredded Gruyère and grated Parmesan cheeses. Sprinkle the cheese mixture generously over the chicken and sauce.
  4. Carefully transfer the skillet to the preheated broiler. Broil for 2-4 minutes, or until the cheese is melted, bubbly, and lightly golden brown. Keep a close eye on it to prevent burning.
  5. Remove from the oven, garnish with fresh parsley (if using), and serve immediately.

Notes

For an extra rich flavor, you can use a splash of brandy or sherry when deglazing instead of white wine. Serve this dish with crusty bread for dipping, mashed potatoes, or a simple green salad to complete the meal. Leftovers can be stored in an airtight container in the refrigerator for up to 3 days. Reheat gently on the stovetop or in the microwave.