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French Onion Stuffed Chicken

A comforting and flavorful dish combining the rich flavors of French onion soup with tender chicken, perfect for cozy family dinners or special occasions.
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Prep Time 20 minutes
Cook Time 30 minutes
Total Time 50 minutes
Servings: 4 servings
Course: Dinner, Main Course
Cuisine: French
Calories: 410
Ingredients Method Notes

Ingredients
  

For the Onion Filling
  • 2 tablespoons unsalted butter Using a high-quality brand for a rich flavor.
  • 4 large onions, halved and thinly sliced Sweet onions like Vidalia work beautifully here.
  • Salt and pepper To taste.
  • 2 teaspoons fresh chopped thyme, divided Fresh thyme adds a fragrant note that dried can’t replicate.
  • 2 tablespoons balsamic vinegar (optional) This will deepen the flavor of the onions, but it’s not a must.
  • 2 cloves garlic, minced
  • ½ cup beef broth or stock, divided Choose low-sodium to control the saltiness.
For the Chicken
  • 1 tablespoon olive oil
  • 4 boneless, skinless chicken breasts Look for organic, free-range chicken for the best quality.
  • 2 teaspoons garlic powder
  • 1 teaspoon ground thyme
  • 1 cup shredded Gruyere cheese (or mozzarella) Gruyere is traditionally used for its meltability; however, mozzarella will work too.
  • 4 tablespoons freshly grated parmesan cheese

Method
 

Preparation
  1. Preheat your oven to 400°F (200°C) and lightly grease a 9×12-inch baking dish.
  2. In a large skillet, melt the butter over medium-high heat and add the sliced onions, salt, pepper, and half of the thyme. Cook for 5–8 minutes until softened.
  3. Reduce the heat to medium and caramelize the onions for about 15 minutes until they are a deep golden brown and jammy.
  4. If the pan dries out, add ¼ cup of beef broth.
  5. Optionally, deglaze the pan with balsamic vinegar, stir well, and let it reduce for 1 minute.
  6. Add minced garlic to the onions, stir and cook for another minute, then remove from heat.
  7. Slice the chicken breasts horizontally to create pockets and season with salt, pepper, garlic powder, and ground thyme.
  8. Generously stuff the chicken breasts with the caramelized onion mixture, Gruyere, and parmesan. Seal openings with toothpicks.
  9. Transfer any remaining onions to the baking dish, mix with the remaining ¼ cup of broth, and place stuffed chicken on top.
Cooking
  1. Heat olive oil in the skillet and sear each stuffed chicken breast for 4 minutes on each side.
  2. Return the chicken to the baking dish, spoon some pan juices over the top, sprinkle remaining thyme, and bake for 15–20 minutes until the chicken reaches an internal temperature of 165°F (75°C).
  3. Remove toothpicks and serve warm.

Notes

Using fresh, high-quality ingredients will make all the difference in flavor. You can assemble the stuffed chicken the night before and bake it when you're ready. Store leftovers in an airtight container in the fridge for up to 3 days or freeze for up to 3 months.