Creating stuffing stuffed chicken is straightforward if you follow these easy steps:

1. Preheat Oven: Preheat your oven to 375°F (190°C).
2. Prepare the Stuffing: In a bowl, combine the stuffing mix, chicken broth, diced onion, diced celery, garlic powder, thyme, salt, and pepper. Mix well and let it sit for 10 minutes to absorb the liquid.
3. Prepare the Chicken: Carefully slice a pocket into each chicken breast, making sure not to cut all the way through.
4. Stuff the Chicken: Divide the stuffing mixture among the chicken breasts, filling each pocket generously. If using Parmesan cheese, sprinkle some into the stuffing before sealing.
5. Secure the Filling: Use toothpicks to secure the openings of the stuffed chicken breasts, ensuring the stuffing doesn’t spill out during cooking.
6. Season the Chicken: Rub the outside of the chicken breasts with olive oil and season with additional salt and pepper as desired.
7. Place in Baking Dish: Place the stuffed chicken breasts in a greased baking dish.
8. Cover and Bake: Cover the dish with aluminum foil and bake for 25 minutes.
9. Remove Foil: Uncover and bake for an additional 10-15 minutes, or until the chicken is cooked through with an internal temperature of 165°F (75°C).
10. Rest: Remove from the oven and let the chicken rest for 10-15 minutes before serving.
11. Serve: Carefully remove toothpicks and garnish with fresh parsley if desired.

These steps will guide you in creating a mouthwatering and satisfying dish that is sure to impress anyone at your table.