01 - Preheat oven to 375°F. Lightly grease a baking dish with cooking spray or a small amount of olive oil.
02 - Heat 1 tablespoon olive oil in a large skillet over medium heat. Add minced garlic and sauté for 30 seconds until fragrant. Add chopped spinach and cook, stirring frequently, until wilted (2–3 minutes). Remove from heat and allow to cool slightly.
03 - In a mixing bowl, combine sautéed spinach, crumbled feta cheese, fresh dill, dried oregano, ground nutmeg, and lemon zest. Mix thoroughly until ingredients are evenly distributed.
04 - Using a sharp knife, carefully cut a horizontal pocket into the side of each chicken breast, stopping before cutting completely through. Open pockets gently to create space for filling.
05 - Generously season the interior and exterior of each chicken breast with salt and freshly ground black pepper, ensuring even coverage.
06 - Divide the spinach-feta mixture evenly among the four chicken breasts, stuffing each pocket. Secure openings by inserting toothpicks horizontally or tying with kitchen twine to prevent filling leakage during cooking.
07 - Heat 1 tablespoon olive oil in the skillet over medium-high heat. Place stuffed chicken breasts in the pan and sear for 2–3 minutes per side until a golden-brown crust forms.
08 - Transfer seared chicken breasts to the prepared baking dish. Bake for 20–25 minutes, or until internal temperature reaches 165°F when measured with a meat thermometer inserted into the thickest portion.
09 - Remove from oven and carefully remove all toothpicks or twine before serving. Allow chicken to rest for 3–5 minutes for juices to redistribute.