01 - Preheat oven to 400°F. 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 30 seconds until fragrant, then add chopped spinach and sauté until wilted, about 2 to 3 minutes. Remove from heat and allow to cool slightly.
03 - In a mixing bowl, blend sautéed spinach mixture with crumbled feta, softened cream cheese, parsley, oregano, nutmeg, salt, and pepper until well incorporated.
04 - Using a sharp knife, create a horizontal pocket in each chicken breast without cutting through completely.
05 - Coat the exterior of each chicken breast with 1 tablespoon olive oil, then season evenly with salt, black pepper, and paprika.
06 - Fill each chicken breast pocket with the spinach and feta mixture, securing with toothpicks if needed.
07 - Arrange the stuffed breasts in the prepared baking dish and bake for 25 to 30 minutes until cooked through, reaching an internal temperature of 165°F.
08 - Remove toothpicks before plating; serve hot.