Creating Mushroom Stuffed Chicken is straightforward if you follow these simple steps:

1. Preheat Oven: Preheat your oven to 375°F (190°C).
2. Prepare Chicken: Using a sharp knife, carefully slice a pocket into each chicken breast. Season both sides with salt and pepper.
3. Sauté Mushrooms: In a large skillet, heat olive oil over medium heat. Add minced garlic and sauté for 1 minute. Stir in chopped mushrooms and spinach, cooking until softened (about 5-7 minutes).
4. Make Filling: In a bowl, combine sautéed mushrooms, cream cheese, mozzarella cheese, thyme, salt, and pepper. Mix well until all ingredients are fully incorporated.
5. Stuff Chicken: Carefully fill each chicken breast pocket with the mushroom and cheese mixture. Use toothpicks to secure the openings, ensuring the filling doesn’t escape during cooking.
6. Sear Chicken: In the same skillet, heat a little more 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: Transfer the seared chicken breasts to a baking dish and place them in the preheated oven. Bake for 20-25 minutes or until the chicken is cooked through and the internal temperature reaches 165°F (74°C).
8. Rest Chicken: Remove the chicken from the oven and let it rest for 5 minutes. This will help retain the juices.
9. Garnish: Remove the toothpicks and garnish with fresh parsley before serving.

These steps will guide you in creating this delicious dish effortlessly.