01 - Preheat oven to 400°F. Line a baking dish with parchment paper or lightly grease it.
02 - In a skillet, heat 1 tablespoon olive oil over medium heat. Add minced garlic and cook for 30 seconds until fragrant. Add chopped spinach and sauté until wilted, approximately 2 to 3 minutes. Remove from heat and allow to cool slightly.
03 - Combine sautéed spinach, crumbled feta, softened cream cheese, chopped parsley, dried oregano, ground nutmeg, salt, and pepper in a bowl. Mix thoroughly until evenly blended.
04 - Using a sharp knife, carefully cut a horizontal pocket into each chicken breast without cutting completely through.
05 - Brush outside of chicken breasts with 1 tablespoon olive oil, then season with salt, black pepper, and paprika.
06 - Fill each chicken breast pocket with the spinach and cheese mixture. Secure openings with toothpicks if needed.
07 - Arrange stuffed chicken breasts in the prepared baking dish and bake for 25 to 30 minutes until chicken reaches an internal temperature of 165°F and juices run clear.
08 - Remove toothpicks before serving and serve hot.