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French Onion Stuffed Chicken

This French Onion Stuffed Chicken recipe combines the beloved flavors of French onion soup with juicy, tender chicken breasts.
The dish features chicken stuffed with a mixture of caramelized onions and melty Gruyère cheese, creating a gourmet meal that's surprisingly easy to make at home. Perfect for a special dinner or an elevated weeknight meal!
Prep Time 30 minutes
Cook Time 40 minutes
Total Time 1 hour 10 minutes
Course Main Course
Cuisine American, French
Servings 4 Servings
Calories 450 kcal

Ingredients
  

  • 4 large boneless skinless chicken breasts
  • 2 large yellow onions thinly sliced
  • 2 tablespoons butter
  • 1 tablespoon olive oil
  • 1 cup shredded Gruyère cheese
  • ¼ cup grated Parmesan cheese
  • 1 teaspoon fresh thyme leaves
  • Salt and freshly ground black pepper to taste
  • ¼ cup beef broth optional, for extra flavor

Instructions
 

Preparing the French Onion Filling

  • Heat butter and olive oil in a large skillet over medium heat.
  • Add sliced onions and a pinch of salt. Cook, stirring occasionally, for 25-30 minutes until deeply caramelized and golden brown. Be patient – good things take time!
  • In the last 5 minutes, add thyme leaves and beef broth (if using) to deglaze the pan and intensify the flavor.
  • Remove from heat and let cool slightly.
  • In a bowl, mix the caramelized onions with Gruyère and Parmesan cheese.
  • The key to perfect caramelized onions is low and slow cooking. Don't rush this step – it's what gives the dish its signature French onion flavor!

Stuffing and Cooking the Chicken

  • Preheat your oven to 375°F (190°C).
  • Using a sharp knife, carefully cut a pocket into each chicken breast. Don't cut all the way through!
  • Season the inside and outside of each chicken breast with salt and pepper.
  • Stuff each pocket with the French onion filling, being careful not to overfill.
  • Secure the openings with toothpicks if needed.
  • Heat a tablespoon of oil in an oven-safe skillet over medium-high heat.
  • Sear the stuffed chicken breasts for 3-4 minutes on each side until golden brown.
  • Transfer the skillet to the preheated oven and bake for 15-20 minutes, or until the internal temperature reaches 165°F (74°C).

Notes

Remember, the cooking time may vary depending on the size of your chicken breasts. Always use a meat thermometer to ensure they're fully cooked!
Keyword French Onion Chicken, French Onion Stuffed Chicken, Stuffed Chicken Breast