01 - Preheat your oven to 400°F (200°C). Line a baking dish with parchment paper or apply a light coat of non-stick spray.
02 - In a medium mixing bowl, combine the softened cream cheese, shredded mozzarella, grated Parmesan, finely chopped parsley, minced garlic, dried oregano, and paprika. Stir until uniformly smooth and well-integrated. Set aside.
03 - Thoroughly pat the chicken breasts dry with paper towels. Employing a sharp knife, carefully create a horizontal pocket within the thickest side of each chicken breast, ensuring you do not cut through to the other side.
04 - Season the interior and exterior surfaces of each chicken breast generously with salt and freshly ground black pepper.
05 - Evenly distribute the prepared cheese mixture into the pocket of each chicken breast. If necessary, secure the opening with small toothpicks to prevent the filling from escaping during cooking.
06 - Brush the exterior of each stuffed chicken breast with the remaining olive oil, creating a light sheen.
07 - Arrange the stuffed chicken breasts in the prepared baking dish. Bake for 25–30 minutes, or until the internal temperature of the chicken reaches 165°F (74°C) and the cheese filling is molten and bubbling.
08 - Carefully remove any toothpicks. Allow the stuffed chicken breasts to rest for 5 minutes before serving to allow the juices to redistribute.