01 - Set the oven to 400°F and line a baking dish with parchment paper or lightly grease it.
02 - Heat 1 tablespoon olive oil in a skillet over medium heat. Add minced garlic and cook for about 30 seconds until fragrant. Stir in chopped spinach and sauté until wilted, about 2 to 3 minutes. Remove from heat and allow to cool slightly.
03 - In a mixing bowl, combine the sautéed spinach, crumbled feta, softened cream cheese, chopped parsley, dried oregano, ground nutmeg, and season with salt and pepper. Mix thoroughly until fully incorporated.
04 - Using a sharp knife, carefully slice a horizontal pocket into each chicken breast, avoiding cutting all the way through.
05 - Brush the exterior of the chicken breasts with 1 tablespoon olive oil, then season evenly with salt, black pepper, and paprika.
06 - Fill each chicken pocket with the prepared spinach and feta mixture. Secure with toothpicks if needed.
07 - Arrange stuffed chicken breasts in the prepared baking dish. Bake in the preheated oven for 25 to 30 minutes until the internal temperature reaches 165°F and juices run clear.
08 - Remove toothpicks carefully before plating. Serve hot with your choice of sides.