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French Onion Stuffed Chicken Breast

  • Author: chefjar
  • Total Time: 1 hour
  • Yield: 4 1x


  • 2 tablespoons unsalted butter
  • 4 large white onions, halved and thinly sliced
  • Ground black pepper and salt, as needed
  • 2 teaspoons dried thyme, divided
  • 2 tablespoons balsamic vinegar
  • 3 garlic cloves, minced
  • 3/4 cup beef broth or stock, divided
  • 3 tablespoons olive oil
  • 4 boneless and skinless chicken breasts
  • 1 cup shredded mozzarella cheese
  • 1/4 cup freshly grated parmesan cheese
  • 5-6 fresh sage leaves, plus more to garnish


  • Preheat oven to 400°C (200°C). Drizzle a 9x12-inch baking dish with olive oil. Keep aside.
  • Melt butter over medium high heat in a large pan or skillet. Add the sliced onions and season with salt, 1 teaspoon of dried thyme and ground black pepper. Cook for 8-10 minutes or until  soft.
  • Reduce heat to medium and cook until onions are caramelized ( about 15 minutes), stirring from time to time.
  • Pour in 1/4  cup of broth and balsamic vinegar and cook until the pan gets dry. The onions should be browned an look jammy.
  • Add in garlic and cook until fragrant, about 1 minute. Remove from the heat and allow to cool slightly.
  • Place the chicken breast on a cutting board, put you hand on top of the breast and carefully cut an opening, about 3/4 of the way through the breast. Repeat with the remaining breasts. Season all over and inside with 1 teaspoon thyme, salt and pepper.
  • Stuff with 2 tablespoons  of french onions, cheeses and seal with toothpicks. 
  • Transfer the remaining french onion and 1/2 cup of broth to the prepared baking dish. Keep aside.
  • Heat oil in the same skillet over medium high heat.  Sear the stuffed chicken for 4-5 minutes each side or until golden brown. Transfer to the prepared baking dish.
  • Top with fresh sage leaves. 
  • Bake  for 15-20 minutes or until fully cooked. Enjoy!
  • Prep Time: 15 min
  • Cook Time: 45 min
  • Category: Chicken recipes
  • Cuisine: French


  • Calories: 557kcal
  • Sugar: 6g
  • Sodium: 655mg
  • Fat: 29g
  • Saturated Fat: 10g
  • Carbohydrates: 14g
  • Fiber: 3g
  • Protein: 55g
  • Cholesterol: 185mg

Keywords: french onion stuffed chicken breast, stuffed chicken breast, chicken fillet, chicken breast recipes