Creating Stuffed Chicken with Savory Stuffing is straightforward if you follow these carefully outlined steps:

1. Preheat the Oven: Preheat your oven to 375°F (190°C).

2. Prepare the Filling: In a skillet over medium heat, add 1 tablespoon of olive oil. Sauté the chopped onions and celery until softened, about 5-7 minutes. Add minced garlic and cook for an additional minute.

3. Mix Ingredients: In a bowl, combine the sautéed vegetables with bread crumbs, dried thyme, sage, black pepper, salt, chicken broth, and Parmesan cheese. Mix well until fully combined.

4. Prepare Chicken: Place each chicken breast between two pieces of plastic wrap or parchment paper. Gently pound them to an even thickness of about ¾ inch for even cooking.

5. Stuff the Chicken: Generously fill each chicken breast with the stuffing mix. Use toothpicks or kitchen twine to secure the opening to prevent the stuffing from spilling out.

6. Sear the Chicken: In a large oven-safe skillet, heat 2 tablespoons of olive oil over medium-high heat. Add the stuffed chicken breasts and sear for about 3-4 minutes on each side, until golden brown.

7. Bake in Oven: Once browned, transfer the skillet to the preheated oven. Bake the stuffed chicken for 25-30 minutes or until cooked through (internal temperature should reach 165°F/74°C).

8. Rest the Chicken: Remove the skillet from the oven and let the chicken rest for about 5 minutes before slicing. This helps the juices redistribute for maximum flavor.

9. Garnish and Serve: Sprinkle chopped parsley over the stuffed chicken before serving to brighten the dish.