Preheat the Oven
Set your oven to 375°F (190°C). Starting with a fully heated oven ensures even cooking and keeps the chicken moist.
Mix the Filling
In a medium bowl, combine spinach, cream cheese, mozzarella, Parmesan, garlic, Italian seasoning, salt, and pepper. Stir until smooth and evenly blended. The mixture should be creamy and well incorporated.
Prepare the Chicken
Using a sharp knife, carefully cut a pocket into the side of each chicken breast. Be cautious not to slice all the way through.
Fill the Chicken
Spoon the creamy spinach mixture into each pocket. Press gently to secure the filling inside.
Sear for Flavor
Heat olive oil in a large skillet over medium heat. Place the stuffed chicken breasts in the pan and cook for 3–4 minutes per side, until golden brown. This step locks in moisture and adds a beautiful crust.
Bake to Perfection
Transfer the seared chicken to a baking dish and bake for 20–25 minutes, or until the internal temperature reaches 165°F (74°C).
Rest Before Serving
Allow the chicken to rest for 5 minutes before slicing. This keeps the juices inside and ensures tender, flavorful bites.