01 - Set the oven to 400°F and lightly grease a baking dish.
02 - Using a sharp knife, carefully cut a pocket into the side of each chicken breast without slicing through completely.
03 - Season both the interior and exterior of each chicken breast with salt and black pepper.
04 - In a bowl, combine chopped spinach, crumbled feta, cream cheese, minced garlic, parsley, oregano, and nutmeg. Mix thoroughly until well incorporated.
05 - Fill each chicken breast pocket generously with the spinach and feta mixture, securing with toothpicks if necessary.
06 - Place the stuffed breasts into the baking dish, drizzle with olive oil, and sprinkle evenly with paprika.
07 - Bake for 25 to 30 minutes until the chicken reaches an internal temperature of 165°F and the juices run clear.
08 - Allow the chicken to rest for 5 minutes before removing toothpicks and slicing to serve warm.