01 - Preheat the oven to 400°F. Lightly grease a baking dish with cooking spray or a small amount of olive oil.
02 - Heat a skillet over medium heat. Add fresh spinach and cook for 2–3 minutes until just wilted. Remove from heat and let cool slightly.
03 - In a mixing bowl, combine cooked spinach, crumbled feta cheese, softened cream cheese, minced garlic, chopped dill, ground nutmeg, and black pepper. Mix until thoroughly blended and creamy.
04 - Pat chicken breasts dry with paper towels. Using a sharp knife, carefully cut a horizontal pocket into the side of each chicken breast, taking care not to cut all the way through.
05 - Divide the spinach-feta mixture evenly among the chicken breasts. Fill each pocket with the stuffing, securing with toothpicks if necessary to keep the filling contained.
06 - Brush the outside of each chicken breast with olive oil. Season generously with salt, black pepper, and paprika, ensuring even coverage on all sides.
07 - Place the stuffed chicken breasts in the prepared baking dish, spacing them evenly to allow proper heat circulation.
08 - Bake for 25–30 minutes until the chicken is completely cooked through. The internal temperature should reach 165°F when measured with a meat thermometer, and juices should run clear.
09 - Remove the toothpicks carefully. Let the chicken rest for 5 minutes before serving to allow juices to redistribute. Garnish with fresh lemon wedges and chopped parsley if desired.