1. To begin, preheat your oven to 375°F. This sets the stage for the perfect baking environment to ensure your Apple and Brie Stuffed Chicken turns out delicious.

2. Next, take the chicken breasts and place them on a cutting board. Using a sharp knife, carefully cut a pocket into each chicken breast, being sure not to cut all the way through. This will create the perfect cavity to hold the mouthwatering filling.

3. In a bowl, combine the diced apples, Brie cheese, and baby spinach leaves. Season the mixture with salt, pepper, garlic powder, onion powder, and dried thyme. Mix everything together until well-combined, creating the irresistible filling for your chicken.

4. Gently stuff each chicken breast pocket with the apple and Brie mixture, using your fingers to ensure the filling is evenly distributed. To keep the filling intact, secure the open edges of the chicken with toothpicks or kitchen twine.

5. Now, it’s time to prepare the chicken for the oven. Brush the outside of the stuffed chicken breasts with the olive oil, and then season them with additional salt, pepper, and dried thyme for an extra burst of flavor.

6. Place the prepared Apple and Brie Stuffed Chicken in a shallow baking dish and pop it into the preheated oven. Bake for 30-35 minutes, or until the chicken is cooked through and the internal temperature reaches 165°F.

7. Once the chicken is perfectly baked, remove it from the oven and let it rest for 5 minutes before serving. This resting period allows the juices to redistribute, ensuring every bite is bursting with flavor.